JPH11336599A - Operation control device in internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable suitable operation control according to a valve opening lap of an intake valve and an exhaust valve by computing a valve opening lap amount according to the detection value of an operation amount detector, and changing at least one of a fuel injection quantity, an ignition timing and an exhaust gas recirculation quantity from an exhaust system to an intake system according to the detected lap amount. SOLUTION: An actuator 51 is provided with an operation amount detector 60 for detecting the operation amount of the actuator 51 as a representative of the operation amount of an intake valve. The operation of the actuator 51, that is, the opening and closing operation of the intake valve is controlled by a control unit 59. When a valve opening lap of the intake valve and the exhaust valve is caused, it is desirable that a fuel injection quantity, an ignition timing or an exhaust gas re-circulation quantity from an exhaust system to an intake system is changed to conduct suitable operation control for an engine. The control unit 59 controls the operation of the engine according to the output of the operation amount detector 60 and a detection value of a rotating speed detector 66 for detecting the rotating speed of the engine.

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 in which an actuator is connected to at least one of an intake valve and an exhaust valve so that the opening timing of the intake valve can be changed according to the operating state of the engine. In particular, the present invention relates to an operation control device for appropriately controlling the operation of the engine in response to a change in the opening timing of the intake valve.

[0002]

2. Description of the Related Art Conventionally, such an internal combustion engine is known, for example, from Japanese Patent Application Laid-Open No. 3-92520, and the operation characteristics of the intake valve are changed to the operating state of the engine by opening and closing the intake valve with an actuator. It is made to change arbitrarily according to.

[0003]

When the opening timing of the intake valve is arbitrarily changed by driving the intake valve to be opened and closed by an actuator, both the intake valve and the exhaust valve are opened and wrapped. During such a valve opening lap, exhaust gas recirculation (internal EGR) occurs in the combustion chamber of the engine, and the combustion state in the combustion chamber also changes. Therefore, when the opening lap of the intake valve and the exhaust valve occurs, appropriate operation control of the engine can be performed by changing the fuel injection amount, the ignition timing, or the exhaust gas recirculation amount from the exhaust system to the intake system. Although it is desirable, there is no description in the above-mentioned prior art about such control according to the opening lap of the intake valve and the exhaust valve.

The present invention has been made in view of such circumstances, and has been made in such a manner that an opening / closing operation characteristic of an intake valve can be arbitrarily changed by changing an opening start timing of the intake valve by an actuator. It is another object of the present invention to provide an operation control device for an internal combustion engine capable of performing appropriate operation control according to the opening lap of an intake valve and an exhaust valve.

[0005]

In order to achieve the above object, according to the present invention, at least one of an intake valve and an exhaust valve is opened according to an operating state of the engine. In an internal combustion engine in which an actuator is connected so that the start time can be changed, an operation amount detector for detecting an operation amount of an intake valve, and an opening lap amount of an intake valve and an exhaust valve based on a detection value of the operation amount detector And a control unit that changes at least one of a fuel injection amount, an ignition timing, and an exhaust gas recirculation amount from the exhaust system to the intake system based on the valve opening lap amount.

[0006] According to this configuration, the amount of change per unit time of the operation amount of the intake valve detected by the operation amount detector, that is, the operation speed, and the crank of the exhaust valve closing end timing and the intake valve opening start timing are determined. Based on the angle difference, it is possible to obtain the opening lap amount of the intake valve and the exhaust valve. Further, the valve opening lap amount corresponds to the internal EGR amount in the combustion chamber, and based on the internal EGR amount, at least one of the fuel injection amount, the ignition timing, and the exhaust gas recirculation amount from the exhaust system to the intake system. By changing one of them, the engine can be appropriately operated according to the internal EGR amount.

[0007] The invention according to claim 2 provides the above-described claim 1.
In addition to the configuration of the invention described, further comprising a rotation speed detector that detects the engine rotation speed, wherein the control unit corrects the valve opening lap amount according to the detection value of the rotation speed detector, According to such a configuration, the engine opening lap amount calculated based on the detection value detected by the operation amount detector and the actual valve opening lap amount differ based on the engine speed. By correcting the valve opening lap amount according to the rotation speed, more appropriate operation control according to the engine rotation speed can be performed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

1 to 11 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a main part of an internal combustion engine, FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1, and FIG. 1 is an enlarged cross-sectional view taken along line 3-3 of FIG. 1, FIG. 4 is a cross-sectional view showing a schematic configuration of the actuator, FIG. 5 is a characteristic diagram of lift of an intake valve, and FIG. FIGS. 7 and 8 are cross-sectional views showing the operation status of the actuator in the valve-opening holding state, FIG. 8 is a cross-sectional view showing the operation status of the actuator in the valve-closing operation, and FIG. FIG. 10 is a diagram showing a valve open lap state of an intake valve and an exhaust valve, and FIG. 11 is a flowchart showing an operation control procedure by a control unit.

First, in FIG. 1, a combustion chamber 15 is formed between an upper surface of a piston slidably fitted to a cylinder block (not shown) and a cylinder head 14. A pair of intake valve ports 16... And a pair of exhaust valve ports 17
Are provided, the two intake valve ports 16 are connected to an intake port 18, and the two exhaust valve ports 17 are connected to an exhaust port 19.

[0011] As the intake valves V _I ... stem 20 ... are of the intake valve ports 16 ... individually openable pair of intake valves slidably fitted with the guide tube 21 ... to the respectively provided in the cylinder head 14 And retainers 22 provided at the upper ends of the stems 20 projecting upward from the respective guide cylinders 21.
A coil-shaped valve spring 23 which surrounds the respective stem 20 ... are provided between the cylinder head 14, with the intake valves V _I ... in a direction to close the intake valve ports 16 ... by their valve springs 23 ... Be inspired. The two exhaust valve ports 17 ... individually openable pair of exhaust valves V _E ... stems 24 ... of slidably fitted with the guide tube 25 ... to the respectively provided in the cylinder head 14, the guide tube Coiled valve springs 27 surrounding the stems 24 are provided between the cylinder head 14 and the retainers 26 provided at the upper end of the stems 24 projecting upward from the cylinders 25. 2
7, the exhaust valves V _E are biased in a direction to close the exhaust valve ports 17.

The two intake valves V _I and the two exhaust valves V _E.
Between them, a camshaft 2 parallel to the axis of a crankshaft (not shown)
8 are rotatably disposed so as to be positioned below the upper end and the upper end of both exhaust valves V _E ... of the intake valves V _I ..., 1 the cam shaft 28 at a reduction ratio of 1/2 And is linked to and connected to the crankshaft so as to rotate counterclockwise. Moreover, an oil bath 30 is formed on the upper surface of the cylinder head 14, and the cam shaft 28 is
The intake-side valve cam 29 _I and the exhaust-side valve cam 29 _{E provided} in the oil bath 8 are arranged at positions where they can be immersed in oil in the oil bath 30.

Both intake valves V_I… And the intake valve on the camshaft 28
Cam 29_IBetween the camshaft 28 and the intake valve
V_I… The intake-side valve train 31 that can be converted to the opening and closing movement of_IBut
Provided, both exhaust valves V_E... and the exhaust side movement of the camshaft 28
Valve cam 29_EExhaust the rotational movement of the camshaft 28
Valve V_EExhaust-side valve train 31 that can be converted to the opening and closing movement of ... _E
Is provided.

Exhaust-side valve train 31_EIs flat with the camshaft 28
Rocker arm shaft 32 that is fixedly arranged with a regular axis
And are rotatably supported by the rocker arm shaft 32 and
Ki valve V _E… And exhaust side valve cam 29_EProvided between
And a rocker arm 33. One end of rocker arm 33
The exhaust valve cam 29_ECam slipper 34 that contacts
The other end of the rocker arm 33 has two exhaust valves V
_E, A pair of tappet screws 35 respectively contacting the upper ends of
…, But the screw is screwed in so that the advance / retreat position can be adjusted.
You.

The intake-side valve gear 31 _I is provided with a planetary gear mechanism 3.
6 and an electric actuator 51 fixed to the head cover 52.

2 and 3, the planetary gear mechanism 36 includes a sun gear 37 rotatable about an axis.
And a ring gear 38 surrounding the sun gear 37 so as to be rotatable about the same axis as the sun gear 37, and a plurality of planetary gears 40... Rotatably supported around an axis parallel to the axes of the sun gear 37 and the ring gear 38. And a carrier 39 which rotates in conjunction with the revolution of the planet gears 40 around the sun gear 37.

Of the sun gear 37, the ring gear 38 and the carrier 39 constituting the planetary gear mechanism 36, on both sides of the sun gear 37, at positions spaced apart in the axial direction of the support shaft 41, on both intake valves V _I. A pair of connecting arms 42 extending,
The bases 42a, 42a of 42 are fitted and fixed, and the front ends of these connecting arms 42, 42 are connected to both intake valves V _I.
Tappet screws 43, 43 which come into contact with the upper ends of the stems 20 ... respectively are screwed in such a manner that the advance / retreat position is adjustable. As a result, the sun gear 37 is connected to both intake valves V
In conjunction with the _I ..., will be connected, the intake valves V _I ... it is opened and closed in response to the rotation of the sun gear 37.

The support shaft 41 has an axis parallel to the axis of the camshaft 28, and is fixedly held by holders 50 fixed on the cylinder head 14.

The carrier 39 among the constituent elements of the planetary gear mechanism 36 includes a base 42 of the connecting arms 42, 42.
a, a pair of ring-shaped support plates 39a, 39a rotatably supported by 42a, and a plurality of support plates 39a, 39a each having an axis parallel to the axis of the support shaft 41 and both ends of which are supported by the two support plates 39a, 39a. For example, it has six shafts 39b, 39b..., And each shaft 39b, 39b. Planet gear 4 meshing with the circumference
Are rotatably supported.

The two supporting plates 39a, 3 of the carrier 39
The 9a, the roller retaining arms 45 extending to the intake side valve operating cam 29 _I side, 45 is provided integrally, an inner surface and the support plates 39a of the rollers holding arms 45, 45, between the inner surface of 39a Are formed with steps 46,46. A roller 44 that is longer than the entire length of the planetary gears 40 in the axial direction is supported between the distal ends of the roller holding arms 45. That is, both ends of the roller shaft 47 having an axis parallel to the axis of the support shaft 41 are fixed between the distal ends of the roller holding arms 45, 45,
A needle bearing 48 is interposed between the roller 44 and the roller shaft 47.

A ring gear 38 of the components constituting the planetary gear mechanism 36 is rotatably supported by a carrier 39. That is, the ring gear 38 formed in a cylindrical shape
Are both supporting plates 39a, 39 in the carrier 39.
a are rotatably supported by the inner peripheral edge of the inner surface a, and at the portions corresponding to the roller holding arms 45 connected to the two support plates 39a, 39a, both ends of the ring gear 38 are supported by the support plates 39a, 39a and Roller holding arm 45, 4
It is rotatably supported by steps 46, 46 formed between the five.

The ring gear 38 is integrally provided with a control arm 49 extending in a direction perpendicular to the axis of the support shaft 41. Also, the head cover 52 includes an actuator 5 having a rod 57 that contacts the control arm 49 in a direction substantially orthogonal to the control arm 49.
1 is fixed.

In FIG. 4, an actuator 51 includes a cylindrical housing 53 and a housing 53.
A first electromagnet 54 fixedly disposed on one end side of the inside and a second electromagnet 55 fixedly disposed on the other end side of the housing 53
A plunger 56 housed in the housing 53 between the two electromagnets 54 and 55; and a rod having a base end connected to the plunger 56 and penetrating the center of the first electromagnet 54 and the housing 53 so as to be movable in the axial direction. 57 and housing 5
And a return spring 58 provided between the housing 53 and a spring receiving portion 57a fixed to the distal end side of the rod 57 outside the rod 3 so that the distal end of the rod 57 contacts the control arm 49 of the ring gear 39. And is fixed to the head cover 52. In addition, the spring load of the return spring 58 is set to be extremely smaller than the spring load of the valve spring 23.

In this actuator 51, the first and
By switching between excitation and demagnetization of the second electromagnets 54 and 55,
To reciprocate the plunger 56, that is, the rod 57.
be able to. Thus, the plunger 56 is formed by the first electromagnet 54.
Intake valve V _IDrive in the valve opening direction
The power acts on the ring gear 38 of the planetary gear mechanism 36,
When the plunger 56 is attracted by the second electromagnet 55
Ring gear of the planetary gear mechanism 36 from the actuator 51
No power acts on the intake valve V_I... haha
The spring force of the spring 23 causes the intake valve cam 29_ICam pro
It will operate with the characteristics according to the fill.

By the way, at the time of the intake valves V _I ... opening of the intake valve V _I ... will be opened and closed by the lift characteristic shown in FIG. In FIG. 5, the intake side valve operating cam 2
9 _I, upon opening and closing the intake valves V _I ... just intake side valve operating cam 29 _I are those having a cam profile that the lift characteristics as indicated by a chain line is obtained, according to the cam profile, with draw valve opening operation start gentle buffer curve C ₁ at the time, lift characteristics to draw a gentle buffer curve C ₂ immediately before closing the seat is obtained.

The actuator 51 is provided with an intake valve.
V_IAt the start of valve opening₁In the intake side valve
Cam 29_IThe intake valve V regardless of the valve opening start time determined by
_I... can be started, as shown in FIG.
Then, the first electromagnet 54 is excited and the plunger 56 is attracted.
Then, the second electromagnet 55 is demagnetized. Then, b
When the pad 57 presses the control arm 49 of the ring gear 38,
The sun gear 37 rotates, and both intake valves V_I… The valve opening direction
Will be activated. At this time, through the roller 44
The roller holding arms 45 are connected to the intake valve cam 29._IPressed by
Then, the sun gear 37 has the actuator 51
And intake side valve cam 29 _IPower from
Act synergistically and accompany the amount of actuation of actuator 51
Lift amount and intake valve cam 29_IBy lift amount
Intake valve V by total amount_I… Will be lifted. sand
Intake valve V_IIs 8 mm, for example.
Sometimes, for example, 7 mm is borne by actuator 51
For example, 1 mm is set to the intake valve cam 29._IBear with
You can do so.

Intake valve V_IWhen the lift amount of the… becomes maximum
Time t_TwoFrom the first electromagnet 54 as shown in FIG.
At the time t_ThreeThe first train
Demagnetize magnet 54 and excite second electromagnet 55
And the intake valve V_I... opens the valve closing operation by the spring force of the valve spring 23
In the actuator 51, as shown in FIG.
The rod 57 is pushed by the control arm 49 so that the plunge
The magnetic member 56 is attracted to the second electromagnet 55 side. This
The intake valve V_ITime t just before valve closing _FourFrom
Intake side valve operating cam 29_ILift determined by cam profile
Characteristics, and the intake valve V_I... is the buffer curve C_TwoTo
Therefore, the valve is gently closed.

[0028] After the intake valves V _I ... closed seating, there until the plunger 56 as shown in Figure 9 is sucked into the second electromagnet 55 side, and the tip of the rod 57 of the actuator 51, the control arm 49 There is a gap between them, so that the spring force of the return spring 58 does not act on the planetary gear 36 and does not disturb the operation of the intake valves V _I.

[0029] In this manner, it is possible to vary freely the timing start intake valves V _I ... opening of by controlling the excitation start timing of the first electromagnet 54, the excitation start timing of the second electromagnet 55 can be changed freely intake valves V _I ... start timing of closure of the by controlling.

The actuator 51 has an intake valve V _I
The actuator 51 is representative of the operation amount of the actuator 51.
An actuation amount detector 60 for detecting the actuation amount is provided. As shown in FIG. 4, one end of the actuating amount detector 60 is coaxial with a case 61 fixed to the outer surface of the other end of the housing 53 (the second electromagnet 55 side) of the actuator 51 and a plunger 56 of the actuator 51. A detection rod 62 which is continuously provided and penetrates the second electromagnet 55 and the housing 53 movably in the axial direction, and the other end of which is inserted into the case 61;
And a resistor 64 fixed to the inner surface of the case 61 so that a brush 64 attached to the brush holder 63 is brought into sliding contact with the brush holder 63. The operation amount detector 60 outputs a potential corresponding to the position of the brush 64 corresponding to the operation position of the plunger 56, that is, the sliding position of the brush 64 to the resistor 65.

The operation of the actuator 51, that is, the opening / closing operation of the intake valves V _I ... Is controlled by the control unit 59. When the opening timing of the intake valves is arbitrarily changed, as shown in FIG. In some cases, the intake valve and the exhaust valve may open and lap, and during such valve-open lap, exhaust gas recirculation (internal EGR) occurs in the combustion chamber of the engine and combustion in the combustion chamber 15 occurs. The state will also change. Therefore, when the intake valves V _I ... and exhaust valves V _E ... open laps occur, by changing the fuel injection amount, ignition timing, or the amount of exhaust gas recirculation from the exhaust system to the intake system, an appropriate engine It is desirable to perform operation control. Therefore, the control unit 59 controls the operation of the engine according to the procedure shown in FIG. 11 based on the output of the operation amount detector 60 and the detection value of the rotation speed detector 66 (see FIG. 1) for detecting the rotation speed of the engine. Control.

In FIG. 11, in step S1, the intake air
Valve V_IThe opening timing of the exhaust valve V _EEnd time of valve closing
Earlier, that is, a valve opening lap occurs
Judgment as to whether valve opening lap has occurred
Sometimes, the process proceeds to step S2.

[0033] In step S2, stores the wrap angle α is the crank angle to the exhaust valves V _E ... closing end timing from the intake valve V _I ... open-starting timing of driving the actuator 51 in the next step S3 I do.

In step S4, the valve opening speed of the intake valves V _I ... Is calculated. In calculating the valve opening speed, the detection value of the operation amount detector 60 for detecting the operation amount of the actuator 51 is determined by the intake air. the valve V _I ... a predetermined lift amount L
At a constant sampling period to reach (see FIG. 10) reads, by dividing the number of times of sampling the detected value of the operation quantity detector 60 when the valve-opening drive V _I ... intake valve to a predetermined lift amount L , so as to obtain the intake valves V _I ... opening speed of.

In step S5, based on the valve opening speed obtained in step S4 and the lap angle α stored in step S2, the lap amount of the valve opening lap (the hatched portion in FIG. Area).

In step S6, the valve opening lap amount obtained in step S5 is corrected according to the engine speed detected by the speed detector 66. When the engine speed is high, the lap amount is determined. Is small, and when the engine speed is small, the lap amount is largely corrected.

In step S7, the fuel injection amount, the ignition timing, and the exhaust gas recirculation amount (external EGR amount) from the intake system to the exhaust system are corrected based on the valve opening lap amount corrected in step S6. Therefore, the fuel injection amount is corrected so that the injection amount is reduced when the valve opening lap amount is large, and the ignition timing is corrected so that the ignition timing is advanced when the valve opening lap amount is large. The external EGR amount is corrected so as to reduce the external EGR amount when the valve opening lap amount is large.

On the other hand, when it is determined in step S1 that the valve opening lap does not occur, the actuator 51 is driven in step S8, and in step S9, the fuel injection amount,
The ignition timing and the external EGR amount are maintained at the previous values.

Next, the operation of this embodiment will be described.
And the intake valve V_I… Is basically the actuator 51
The intake valve V_IActivating the operating characteristics of
It can be changed freely by controlling the operation of the heater 51.
it can. Moreover, the intake valve V_IActuator when the valve is closed
Inputting the power of the eta 51 to the planetary gear mechanism 36
By stopping, the intake valve V_I… The valve closing action is on the intake side
Valve cam 29_IAccording to the cam profile.
Also, the intake side valve operating cam 29_IThe cam profile is an intake valve
V_IImmediately before the valve is closed, cushion curve C_TwoDraw lift special
And the intake valve
V_IImmediately before the valve is seated, the intake valve cam 29_IMosquito
Intake valve V according to the_ISit down gently
The intake valve V_IPrevent bounces from occurring
Can be. Thereby, the intake valve V _ISlow operation of ...
Control of the operation of the actuator 51 to obtain
It is not necessary to control finely with 59
The operation control of the data 51 can be simplified.

The operation amount detector 60 for detecting the operation amount of the actuator 51 for driving the intake valves V _I ... Substantially detects the operation amount of the intake valves V _I. , a variation or working speed per time detection value of the operation amount detector 60, the wrap angle α is the crank angle difference of the exhaust valves V _E ... closing end timing and the intake valve V _I ... open-starting timing of the based on the bets, as corresponding to the internal EGR amount in the combustion chamber 15, together with obtaining the valve opening overlap amount of the intake valves V _I ... and the exhaust valves V _E ..., based on the valve opening overlap amount, the fuel The injection amount, the ignition timing, and the exhaust gas recirculation amount from the exhaust system to the intake system are changed. Therefore, the engine can be appropriately operated according to the internal EGR amount.

In addition, a difference corresponding to the engine speed occurs between the valve opening lap amount calculated based on the detection value detected by the operation amount detector 60 and the actual valve opening lap amount.
Since the control unit 59 corrects the valve opening lap amount according to the detection value of the engine speed detector 66 for detecting the engine speed,
More appropriate operation control according to the engine speed becomes possible.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

For example, in the above embodiment, the fuel injection amount, the ignition timing, and the exhaust gas recirculation amount from the exhaust system to the intake system are all changed according to the valve opening lap amount. At least one of the exhaust gas recirculation amounts from the exhaust system to the intake system may be changed.

[0044] In the above embodiment has been described an exhaust valve V _E ... operating characteristics of those constant, exhaust valves V _E
The present invention can also be applied to a device in which the operating characteristics of... Are changed.

Further, in the above embodiment, the operation amount detector 60
, The operation amount of the actuator 51 is detected. However, the operation amount of the intake valves V _I ... May be directly detected, or the planetary gear mechanism 36 provided between the actuator 51 and the intake valves V _I. The operation amount of any one of the sun gear 37, the ring gear 38, and the carrier 39 may be detected.

[0046]

As described above, according to the first aspect of the present invention, the opening lap amount of the intake valve and the exhaust valve corresponding to the internal EGR amount in the combustion chamber is obtained, and the internal EGR amount is changed. By appropriately changing at least one of the fuel injection amount, the ignition timing, and the exhaust gas recirculation amount from the exhaust system to the intake system, the engine can be appropriately operated according to the internal EGR amount.

According to the second aspect of the present invention, the valve opening lap amount is corrected according to the engine speed, so that more appropriate operation control according to the engine speed can be performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of an internal combustion engine.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged sectional view taken along line 3-3 of FIG. 1;

FIG. 4 is a sectional view showing a schematic configuration of an actuator.

FIG. 5 is a characteristic diagram showing a valve lift characteristic of an intake valve;

FIG. 6 is a cross-sectional view showing an operation state of an actuator at the start of valve opening.

FIG. 7 is a cross-sectional view showing an operation state of the actuator in a valve-open holding state.

FIG. 8 is a cross-sectional view showing an operation state of the actuator during a valve closing operation.

FIG. 9 is a cross-sectional view illustrating an operation state of the actuator in a valve-closed holding state.

FIG. 10 is a view showing a valve open lap state of an intake valve and an exhaust valve.

FIG. 11 is a flowchart illustrating an operation control procedure performed by the control unit.

[Explanation of symbols]

51 ... actuator 59 ... control unit 60 ... operation quantity detector 66 ... rotational speed detector V _E ... exhaust valves V _I ... intake valve

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02D 13/02 F02D 13/02 J 41/04 301 41/04 301Z F02M 25/07 550 F02M 25/07 550R F02P 5/15 F02P 5/15 A

Claims (2)

[Claims] 1. An intake valve (V)_I) And exhaust valve (V_E)of
At least the intake valve (V_I), Depending on the operating condition of the engine
The intake valve (V_I) Can be changed
In an internal combustion engine to which an actuator (51) is connected
And the intake valve (V _IWorking amount detector that detects the working amount
(60) and a detection value of the operation amount detector (60).
And the intake valve (V_I) And exhaust valve (V_E) Valve opening lap amount
And the fuel injection based on the valve opening lap amount.
Volume, ignition timing and exhaust gas recirculation from exhaust system to intake system
Control unit (59) for changing at least one of the quantities
Operation control in an internal combustion engine characterized by comprising:
apparatus. 2. A rotational speed detector (6) for detecting an engine rotational speed.
The operation control device according to claim 1, wherein the control unit (59) corrects the valve opening lap amount according to a value detected by the rotation speed detector (66). .