JPH02271012A - Valve driving controller - Google Patents

Abstract

PURPOSE:To enhance the reliability to the driving control of an intake/exhaust valve by compensating the conditions of current application to the electromagnet for driving an intake/exhaust valve so as to accord the actual life quantity to the desired lift quantity. CONSTITUTION:The intake valve 1 of an engine 6 is driven to open or close by an electromagnet 3. Hereupon, a control unit 5 detects the stepping quantity of an accel pedal by an accel sensor 42, the number of revolutions of an engine and the crank angle by a rotation sensor 7, and the lift quantity of the intake valve 1 by a position sensor 4, so as to control the conditions of current application to the electromagnet 3 and to compensate the lift quantity of the intake valve 1 to the crank angle. Hereby, in case that the lift quantity detected by the intake valve 1 and the desired lift quantity sought from the operating conditions of the engine 6 are different, the actual lift quantity is accorded with the desired lift quantity. Accordingly, it turns out that the reliability of the valve driving control improves.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is a valve drive control device that uses electromagnets to open and close the intake and exhaust valves of an engine using electromagnetic force. The present invention relates to a valve drive control device that controls opening/closing drive by an electromagnet to match a drive state calculated from a rotation state.

(Prior art) The opening and closing control of the intake and exhaust valves of an engine is not performed by the conventional camshaft, but by using an electromagnet to attract a magnetic body provided at the shaft end of the valve. The exhaust valve opening/closing drive device was developed in Japanese Patent Application Laid-Open No. 58-183.
It is described in Japanese Patent Laid-open No. 805 or Japanese Patent Application Laid-open No. 76713/1983.

(Problems to be Solved by the Invention) In the intake/exhaust valve opening/closing drive devices disclosed in the above publications, the driving force is transmitted to the intake/exhaust valves without contact, so the opening/closing state of the intake/exhaust valves is determined by an external force. However, the actual lift amount of the intake and exhaust valves during opening/closing operation is detected, and if it differs from the desired lift amount, the energization state of the electromagnet is corrected to achieve the desired lift amount. Since no correction control is performed to ensure that the opening/closing control is performed, there is a problem that the reliability of the opening/closing control is low.

The present invention has been made in view of the above points, and even if the lift amount of the intake and exhaust valves changes with respect to the crank angle due to external force etc., it is corrected to the desired lift amount determined from the operating condition of the engine, and the electromagnetic force An object of the present invention is to provide a valve drive control device that is highly reliable in controlling the opening and closing of intake and exhaust valves driven by a valve.

(Means for Solving the Problems) According to the present invention, there are provided a valve driving means for opening and closing the intake and exhaust valves of the engine using an electric 611 stone, a depression amount detection means for detecting the amount of depression of the accelerator pedal, and a rotation amount of the engine. A rotation detecting means for detecting the number and crank angle, a valve lift amount detecting means for detecting the lift amount of the intake and exhaust valves, and signals from each of the above detecting means control the energization state of the electromagnet, and the crank angle is It is possible to provide a valve drive control device characterized by having an energization amount correction means for correcting the lift amount of the intake and exhaust valves relative to the amount of lift of the intake and exhaust valves.

(Function) The valve drive control device of the present invention detects the lift amount of the intake and exhaust valves during opening/closing operation, and when the lift amount differs from the desired lift amount determined from the engine operating condition, the intake and exhaust valves are detected. The reliability of drive control by the valve drive control device is improved by correcting the energization state of the electric current that drives the valve and making the actual lift amount match the desired lift amount.

(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 a valve drive control device according to the present invention.

Reference numeral 1 designates an intake valve made of a lightweight, high-strength material such as ceramics. The shaft of the intake valve 1 fits into a magnetic passage 21, and a circular shape is formed on the outer periphery of the shaft end of the magnetic passage 21. Permanent magnet 2 is fitted. The permanent magnet 2 has magnetic poles 22, which are N poles, and S poles arranged in parallel in the eight directions of the intake valve 1.
It consists of a magnetic pole 23 which is a pole.

An electromagnet 3 is arranged around the outer periphery of the permanent magnet 2. The electromagnet 3 has four protruding magnetic poles 31 , 32 , 33 , and 34 that face the magnetic poles 22 and 23 of the permanent magnet 2 and are arranged in parallel at a pitch P in the direction of rotation of the permanent magnet 2 , and the outer periphery of the magnetic passage 21 . a yoke member consisting of a fixed magnetic pole 35 facing the surface;
and coils 36, 37, 38, and 39 wound around the protruding magnetic poles 31, 32, 33, and 34, respectively.

In addition, among the above-mentioned coils 36, 37, 38, and 39, coil 3
The winding directions of coil 6 and coil 38, coil 37, coil 39, and +4 are opposite to each other. Further, a position sensor 4 is installed on the fixed magnetic pole 35 to detect the lift amount of the intake valve 1 and output a lift amount signal.

In addition to the output signals of the rotation sensor 7 and position sensor 4,
The signal from the rotation sensor 7, which is disposed near the output shaft of the engine 6 and detects the number of revolutions and crank angle of the engine 6, and the signal from the accelerator sensor 42, which detects the amount of depression of the accelerator pedal, are transmitted to the input/output interface 54. is input to the control unit 5 via. The drive signal for the intake valve 1 is also output to the coils 36, 37, 38, and 39 via the input/output interface 54. However, the signal S1 is applied to the coils 36 and 38, and the signal S2 is output to the coils 37 and 39. In addition to the human output interface 54, the control unit 5 has an R for temporarily storing data and calculation results.
AM 53, ROM 52 that stores programs and various relationship maps, and CPU 51 that performs calculations based on the programs stored in ROM 52. It is composed of a control memory 55 that controls the flow of signals inside the control unit 5, and the like.

Further, the intake valve 1 is supported by a valve guide 8, and is in constant contact with a valve seat 9 disposed at the intake port. A spring 81 is provided between the magnetic passage 21 and the valve guide 8 to prevent the intake valve 1 from lowering when the electromagnet 3 is not in operation.

The driving principle of the intake valve 1 will be explained with reference to FIG.

FIG. 2 is a diagram showing the driving principle of the intake valve.

(a) to (e) of the figures each show the right side of the intake valve 1 step by step, with illustrations of the coils 36, 37, 38, and 39 omitted.

In addition, the coil 36 and the coil 38 and the coil 37 and the coil 3
9, the winding directions are opposite to each other, so the protruding magnetic pole 31 and the protruding magnetic pole M1fi33 and the protruding magnetic pole 32 and the protruding magnetic pole 3 are always connected.
4 and the poles are different from each other. Further, the distance between the fixed magnetic pole 35 and the magnetic passage 21 is minute, and the
Since it does not change due to movement, there is less magnetic force line loss between the electromagnet 3 and permanent magnet 2, and the attraction and repulsion forces acting between the electromagnet 3 and permanent magnet 2 are large, so the driving force for the intake valve 1 increases.

(a) shows a state in which the intake valve 1 is at the top, that is, the intake port is closed.

The signals S1 and S2 cause the protruding magnetic poles 31 and 32 to generate S poles. Then, the N pole 22 of the permanent magnet 2 and the protrusion [
The intake valve 1 is held at a position where the attractive force acting between the magnet 8i31 and the repulsive force acting between the S pole 23 of the permanent magnet 2 and the protruding magnetic poles 31 and 32 are balanced.

Next, the direction of energization of the signal S2 is reversed to move the protruding magnetic pole 32 to N.
Change to pole. Then, the repulsive force that was acting between the S pole 23 and the protruding magnetic pole 32 is reversed to an attractive force, so that the intake valve 1 moves eight times to the position shown in (b).

Next, the direction of energization of the signal S1 is reversed to move the protruding magnetic pole 31 to N.
When changing to the pole, the N pole 22 of the permanent magnet 2 and the protruding magnetic pole 31
The suction force acting between the
8 to the position shown in (C).

Next, by temporarily stopping the signal S2 and reversing the signal, the intake valve 1 can move from the position shown in (d) to the position shown in (e) by 8, and can continue to move in the same manner. .

As shown in the figure, the intake valve 1 moves 8 distances corresponding to the pitch P in each of the above steps (a) to (e). Therefore, the eight moving distances of the intake valve 1 can be controlled by the number of steps.

Next, the operation of the present invention will be explained with reference to FIGS. 3 and 4.

FIG. 3 is a flow diagram illustrating the operation of the apparatus according to the invention.

FIG. 4 is a diagram showing the relationship between the crank angle and the lift amount of the valve, where the horizontal axis shows the crank angle and the vertical axis shows the lift amount of the valve. Furthermore, in the figure, the solid line indicates the relationship determined by calculation, and the broken line indicates the actual operation measured by the position sensor 4.

A rotation speed signal and a crank angle signal from the rotation sensor 7,
Based on the rotational speed No. 48 and the engine load calculated from the depression amount signal from the accelerator sensor 42, the opening timing and maximum lift amount Lv+ of the intake valve 1 are determined.

Next, the measured maximum lift amount Lv and the calculated maximum lift amount Lv are compared, and if L v > L V +, the signal S1 output from the control unit 5
and the signal S2 is corrected to the decreasing side, and if Lv≦Lvl, the signal S1 and the signal S2 are corrected to the increasing side. If the effects of both corrections do not appear, the counter amount of the counter M is increased, and the correction is continued until the counter amount exceeds a predetermined counter amount Ml.

When the correction effect on the maximum lift amount Lv appears, next, the lift amount at top dead center (TDC), which is a reference, is compared. That is, the calculated lift amount t, pl is compared with the measured lift amount Lp, and if Lp>Lp+, the opening/closing timing of the intake valve 1 is advanced based on the crank angle signal. Moreover, if Lp≦LP+, the intake valve 1
Corrects the delay in opening/closing timing. If the effects of both corrections do not appear, the process proceeds to D, where the counter amount of the counter N is increased, and the counter amount reaches a predetermined counter amount N,
Continue correction until exceeds.

Further, when the counter amounts of the counter M and the counter N exceed respective predetermined counter amounts M1 and Nl, a failure signal is output.

Although one embodiment of the intake valve has been described above, the exhaust valve can be similarly implemented, or various different embodiments can be easily constructed without departing from the spirit of the present invention. No limitations are intended to the particular embodiments, other than as described in the claims.

(Effects of the Invention) As explained above, according to the present invention, the lift amount of the intake and exhaust valves during opening/closing operation is detected, and when the lift amount differs from the desired lift amount determined from the operating state of the engine. In this method, the energization state of the electromagnets that drive the intake and exhaust valves is corrected to match the actual lift amount with the desired lift amount, so it is possible to provide a valve drive control device that has high reliability in controlling the drive of the intake and exhaust valves. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the driving principle of the intake valve, FIG. 3 is a flow diagram showing the operation of the device of the present invention, and FIG. FIG. 3 is a diagram showing the relationship between the angle and the valve lift amount. DESCRIPTION OF SYMBOLS 1... Intake valve, 2... Permanent magnet, 3... Electromagnet, 4... Position sensor, 5... Control unit, 6... Engine, 7... Rotation sensor, 42...
・Accelerator sensor.

Claims (1)

[Claims] Valve drive means that opens and closes intake and exhaust valves of the engine using electromagnets, depression amount detection means that detects the amount of accelerator pedal depression, rotation detection means that detects engine rotation speed and crank angle, and lift of the intake and exhaust valves. valve lift amount detection means for detecting the amount; and energization amount correction means for controlling the energization state of the electromagnet based on the signals from each of the detection means and correcting the lift amount of the intake and exhaust valves with respect to the crank angle. A valve drive control device featuring: