JPH03189310A - Electromagnetic force valve driving controller - Google Patents

Abstract

PURPOSE:To enable it to reduce the extent of torque required for cranking by keeping both intake and exhaust valves in a closing state in the case where engine speed at time of starter motor operation is less than the specified value. CONSTITUTION:A controller 5 energizes a lower coil 43, thereby attracting fixed magnetic plate 4, and drives an intake valve 1 in the opening direction via a needle 2, while it feeds alternating power to an exciting coil wound to each of fixed magnetic poles 31-34, making a traveling magnetic field act on a secondary coil 22 of the needle 2, and controls the intake valve 1 for its opening or closing. Here, the controller 5 detects engine speed by a speed sensor 51 if a starter motor is in operation. If the engine speed is lower speed than the specified speed, current-energization for the lower coil 43 is stopped. With this constitution, since the intake valve 1 and an exhaust valve too do not operate till the engine speed is reached to the specified speed during the starter motor operation, the extent of torque required for cranking is this reducible.

Description

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

(Prior art) A conventional intake/exhaust valve opening/closing drive device pushes the end face of the valve shaft from the cam surface of a camshaft that rotates in synchronization with the engine rotational phase via a link mechanism such as a rocker arm or bushing rod. This opens and closes the intake and exhaust valves, which are always biased in the closing direction by springs. Therefore, since the opening/closing timing of the intake and exhaust valves cannot be changed during engine operation, the timing is adjusted to achieve high efficiency when operating at a predetermined engine speed.

(Problem to be Solved by the Invention) As described above, the conventional intake and exhaust valve opening/closing device cannot change the opening/closing timing of the intake and exhaust valves, so the intake and exhaust valves are set in advance even when the engine is started. It is driven to open and close at a predetermined opening and closing timing.

Therefore, the intake and exhaust valves open and close even when the engine is started, that is, when the engine is not running on its own and is being cranked from the outside by the starter motor.

By the way, in order to cause the engine to operate on its own, it is necessary to increase the rotational speed of the engine to a predetermined rotational speed using the starter motor.

However, during cranking, the air taken into the cylinder during the intake stroke is compressed in the next compression stroke, but the pressure WaNA in the compression stroke is around 10 in the case of a gasoline engine, and around 10 in the case of a diesel engine. In the case of 20 or more, the starter motor cannot proceed to the next expansion stroke unless it generates a large torque.

Therefore, if the torque generated by the starter motor decreases due to a decrease in the output of the battery or the like, it is impossible to shift to the expansion stroke and the engine speed cannot be increased to the predetermined speed.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an electromagnetic force valve drive control device that requires less torque of a starter motor when starting an engine.

(Means for Solving the Problems) According to the present invention, an electromagnetic force acting between a movable magnetic pole connected to an intake and exhaust valve of an engine and capable of reciprocating, and a fixed magnetic pole opposing the movable magnetic pole is used to An electromagnetic force valve drive control device that opens and closes a valve includes a rotation detection means for detecting the rotational phase and rotation speed of the engine, and a detection signal from the rotation detection means is inputted so that the rotation speed when the starter motor is operated is set to a predetermined speed. An electromagnetic force valve drive control device can be provided, comprising a valve closing/holding means for prohibiting the operation of the movable magnetic pole and holding the intake/exhaust valve in a closed state in the following cases.

(Function) The electromagnetic force valve drive control device of the present invention does not operate the intake and exhaust valves until the engine speed reaches a predetermined speed while the starter motor is operating when starting the engine, thereby reducing the torque required for cranking. After reaching the predetermined rotational speed, the intake and exhaust valves are operated to cause the engine to operate on its own.

(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 a drive control device of the present invention, and FIG. 2 is a sectional view taken along line II-II.

Reference numeral 1 designates an intake valve disposed in the cylinder 11 of the engine, and is made of a lightweight ceramic material such as silicon nitride, which is excellent in high-temperature strength, or a heat-resistant non-6N 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 closes the intake port.

A mover 2 is connected to the shaft end of the intake valve 1. The mover 2 includes a cylindrical magnetic passage 21 and a plurality of It consists of a second coil 22). The secondary coil 22 is formed by pouring molten aluminum into a groove cut on the outer periphery of the magnetic path 21. Note that the magnetic path 21 is connected to the secondary coil 22.
In order to increase the magnetic flux density acting on the magnet, it is formed from a magnetic material (magnetic body force), for example, formed by radially arranging amorphous thin plates of magnetic metal to form a cylindrical shape. However, since the magnetic path 21 serves as a path for magnetic flux from fixed magnetic poles 31 to 34, which will be described later, it must be arranged so that the path for the magnetic flux is ensured.

Further, in order to prevent the intake valve 1 from lowering when the engine is stopped, the movable element 2 is biased in the closing direction by a spring 12.

A pair of drive parts 3 are provided on the side surface of the movable element 2 with the movable element 2 in between.
is installed. The drive unit 3 includes fixed magnetic poles 31 to 34 arranged opposite to the secondary coil 22, and the fixed magnetic pole 3.
The excitation coil is wound around each of Nos. 1 to 34. Then, alternating power is supplied from a controller 5 to be described later, and a traveling magnetic field is applied to the secondary coil 22 of the movable element 2.

A magnetic plate 4 is disposed on the upper part of the movable element 2, which faces the intake valve 1 with a small gap therebetween when the intake valve 1 is in the seated state. A lower electromagnet 42 having a pair of magnetic poles sandwiching the intake valve 1 is disposed in the direction in which the intake valve 1 is juxtaposed. The magnetic poles of the lower electromagnet 42 are set below the upper end surface of the movable element 2 by a predetermined amount when the intake valve 1 is closed, and are constituted by a lower coil 43 that excites the pair of magnetic poles.

The magnetic plate 4 is reciprocably connected to both magnetic poles of a lower electromagnet 42 via a guide bar 41 made of a non-magnetic material, and is attracted by the lower electromagnet 42 and comes into contact with the upper end surface of the movable element 2, causing the movable This is to drive the child 2 downward. Note that the magnetic plate 4 is always biased upward by a spring 44.

A pair of optical fibers 45 are embedded in the core portion of the lower electromagnet 42. One end of the optical fiber 45 faces the side surface of the shaft of the intake valve 1, and the other end is connected to the operating position sensor 46. A light emitting diode and a phototransistor are disposed 9 inside the operating position sensor 46, and light from the light emitting diode is once irradiated onto the side surface of the shaft portion of the intake valve 1 via one side of the optical fiber 45, The reflected light from the side surface of the part is detected by a phototransistor via the other side of the optical fiber 45. Since the side surface of the shaft is provided with a striped pattern whose light reflectance is different from that of the original side surface of the shaft, the amount of reflected light changes a number of times proportional to the amount of movement of the intake valve 1, and the amount of reflected light changes. The amount of movement can be detected. Further, by making the stripes detected when the intake valve 1 is seated have a different light reflectance from other stripes, it is possible to detect the seated state of the intake valve 1.

The excitation coil and lower coil 43 are connected to the controller 5 and receive power.

In addition to the operating position sensor 46, the controller 5 includes a rotation sensor 51 that detects the engine rotation speed, a position sensor 52 that detects the crank angle, and an accelerator pedal (
A detection signal from a load sensor 53 that detects the amount of depression (not shown) is 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 according to the programs stored in the ROM, and a calculation result. The controller 5 is composed of a RAM for temporarily storing data, a control memory for controlling the flow of signals inside the controller 5, and the like.

Next, the details of control by the controller 5 will be explained.

FIG. 3 is a flow diagram showing control details.

In step 1, it is determined whether or not the starter motor is operating, and if it is, the process proceeds to step 2, where the rotation sensor 51 detects the engine rotation speed N.

Then, in the next step 3, the engine rotation speed N and the predetermined rotation speed Ns are compared, and if the engine rotation speed N is lower than the predetermined rotation speed Ns, the process returns to step 1, and if it is high, the process proceeds to step 4. . That is, the intake and exhaust valves are not driven to open or close and remain closed until the engine speed N reaches the predetermined speed Ns. Therefore, the torque generated by the starter motor required for cranking may be small.

Next, in step 4, the lift amount of the intake and exhaust valves is calculated based on the engine rotation speed N detected in step 2 above.

When the crank angle detected by the position sensor 52 reaches top dead center (TDC), the lower coil 43 is energized to start the opening operation of the intake valve 1. Then, the bottom dead center (BDC) and top dead center (T
DC) is detected once each time, then the bottom dead center (BDC) is detected again.
), the opening operation of the exhaust valve (not shown) is started (step 7).

When the flow of steps 1 to 7 above is repeated, the engine starts rotating its own blades. Then, since the starter motor is stopped, the flow changes from step 1 to step 8.

In step 8, the engine rotation speed N is detected again, and in step 9, a predetermined rotation speed Ni higher than the predetermined rotation speed Ns is compared with the engine rotation speed N detected in step 8. If N has not reached the predetermined rotation speed Ni, self-blade operation has failed, so the process proceeds to step 18, stops the control flow, and waits until the control flow is started again.

If the engine rotation speed N is equal to or higher than the predetermined rotation speed Ni, in step 2, based on the engine load detected from the load sensor 53, in the next step 11, the initial driving force, that is, the amount of current applied to the lower coil 43, The frequency of the alternating power supplied to the excitation coils wound around each of the fixed magnetic poles 31 to 34, the lift amount of the intake and exhaust valves, and the crank angle corresponding to the opening and closing timing of the intake and exhaust valves are calculated.

Next, in step 12, the bottom dead center (BD
C), and monitors the crank angle from the bottom dead center (BDC) up to the timing of intake valve 1. When the opening timing of intake valve 1 is reached, the opening operation of intake valve 1 is performed in step 13. Start.

Then, during the intake valve 1, the top dead center (
At step 16, the operating state of the intake valve 1 is confirmed based on the signal from the operating position sensor 46, and the exhaust valve is adjusted to the next top dead center (TDC). Start the valve opening operation. Then, the operating state of the exhaust valve is confirmed at top dead center (TDC) immediately after the exhaust valve timing.

Although the embodiments of the present invention have been described in detail above, it is clear that the intake valve drive device shown in FIGS. 1 and 2 above can also be applied to exhaust valves, and does not depart from the spirit of the present invention. Insofar, the invention is not limited to specific embodiments, other than as described in the appended claims, as a variety of different embodiments may be readily constructed.

(Effects of the Invention) As explained above, according to the present invention, neither the intake nor the exhaust valves are operated until the engine speed reaches a predetermined speed while the starter motor is operating at the time of starting the engine, which is necessary for cranking. It is possible to provide an electromagnetic force valve drive control device that reduces the torque, operates the intake and exhaust valves after reaching the predetermined rotation speed, and causes the engine to operate on its own.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the drive control device of the present invention, FIG. 2 is a cross-sectional view taken along line II-II, and FIG. 3 is a flow diagram showing control details. DESCRIPTION OF SYMBOLS 1... Intake valve, 2... Mover, 3... Drive part, 4... Magnetic plate, 5... Controller, 22...
Secondary coil, 31-34... Fixed magnetic pole, 42... Lower electromagnet, 46... Operating position sensor.

Claims (1)

[Claims] An electromagnetic force valve drive control device that opens and closes the intake and exhaust valves by electromagnetic force acting between a movable magnetic pole that is connected to the intake and exhaust valves of the engine and can freely reciprocate, and a fixed magnetic pole that faces the movable magnetic poles. a rotation detection means for detecting a rotation phase and a rotation speed; and an intake/exhaust valve that inputs a detection signal from the rotation detection means and prohibits operation of the movable magnetic pole when the rotation speed during starter motor operation is less than a predetermined speed. 1. An electromagnetic force valve drive control device comprising: a valve closing/holding means for holding the valve in a closed state.