JPH11324733A - Control device of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly change the engine torque to the accelerator pedaling amount corresponding to the engine rotating speed at that time by controlling a throttle valve opening of an electronically controlled throttle valve device according to the calculated required throttle valve opening. SOLUTION: In a control device, as shown in the step 202, according to the pedaling amount θ of an accelerator pedal and the engine rotating speed Ne, the required torque to be generated by the internal combustion engine in this condition is calculated. In calculating the required torque, previously the engine rotating speed actually measured according to the engine speed, the actuating amount of an accelerator pedal, and the required torque needed for the engine in this condition are calculated, and the calculated values are made into a three-dimensional map and stored in a memory in the control device. Accordingly, for example, when the actuating amount θ of the accelerator pedal is 40% at the engine rotating speed Ne of 2000 rpm, the value of the required torque is calculated from the three-dimensional map to obtain T.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an internal combustion engine, and more particularly to a control device for an internal combustion engine having an electronically controlled throttle valve device, such as an intake passage length variable device or a variable valve timing device. The present invention relates to a control device for an internal combustion engine that can smoothly change the torque of the engine according to the amount of depression of an accelerator pedal and the engine speed at that time even when a device that causes fluctuation is mounted on the engine.

[0002]

2. Description of the Related Art Conventionally, a control device for an electronically controlled fuel injection type internal combustion engine, which replaces a carburetor type gasoline engine,
In order to obtain a required air-fuel ratio (A / F), the amount of intake air is controlled by a throttle valve that is mechanically connected to and linked with an accelerator pedal, and a fuel amount corresponding to the amount of air is determined. See the background section of the invention in Japanese Patent Publication No. Hei 7-33781). Then, the control device of the internal combustion engine measures the intake air amount determined by the throttle valve opening by a measuring device such as an air flow meter or a Kalman sensor, and determines a final control amount such as a fuel injection amount and an ignition timing corresponding to the measured intake air amount. Is generally calculated and output (for example, a method of controlling the fuel injection amount and the ignition timing of the internal combustion engine is disclosed in Japanese Patent Publication No. 7-94813).

In recent years, vehicles equipped with an electronically controlled fuel injection type internal combustion engine include, in addition to the standard equipment, an electronically controlled throttle valve device, a variable intake air amount device, a VVT (Variable Vacuum).
lvetiming: Variable valve timing Some devices are equipped with a new mechanism such as a device.

[0004]

However, the conventional control device for the above-described electronically controlled fuel injection type internal combustion engine has the following problems. (1) In an engine equipped with a variable intake amount device, the torque may decrease at the timing when the intake amount is varied.

(2) In the case where the VVT device is mounted, the torque may change at the timing of switching the opening / closing timing of the intake valve or the exhaust valve, and the torque may decrease at a specific engine speed. Therefore, an object of the present invention is to
In an electronically controlled fuel injection type internal combustion engine equipped with an electronically controlled throttle valve device, even if a variable intake air amount device or a VVT device is provided with a factor that changes the torque, the engine torque with respect to the accelerator pedal depression amount is determined by An object of the present invention is to provide a control device for an internal combustion engine which can be smoothly changed according to the engine speed at that time.

[0006]

FIG. 1 shows the configuration of the present invention which achieves the above object. As shown in FIG. 1, the present invention relates to a control device for an internal combustion engine provided with an electronically controlled throttle valve device, wherein an accelerator pedal operation amount detecting means detects an operation amount of an accelerator pedal, and the engine speed is reduced. The detecting means detects the engine speed, and the necessary torque calculating means calculates the torque to be generated by the internal combustion engine based on the detected value of the accelerator pedal operation amount and the engine speed at that time. Then, based on the calculated required torque and the engine speed at that time, the required throttle valve opening calculating means calculates the throttle valve opening to be set in the electronically controlled throttle valve device. The calculated required throttle valve opening is input to an electronically controlled throttle valve device to control the throttle valve opening.

The required torque calculating means calculates a required torque to be generated by the internal combustion engine based on a three-dimensional map of the accelerator operation amount, the engine speed and the required torque set in advance.
The throttle valve opening calculating means calculates a required throttle valve opening to be set in the electronic control throttle valve device based on a three-dimensional map of a preset engine speed, a calculated required torque, and a required throttle valve opening. Can be calculated.

According to the present invention, the required throttle valve opening for determining the operating state of the internal combustion engine is calculated according to the required torque calculated from the accelerator pedal depression amount and the engine speed, and the engine speed at that time. The throttle opening of the electronically controlled throttle valve device is controlled based on the calculated required throttle opening.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail based on specific examples with reference to the accompanying drawings.
Before describing an embodiment of the present invention, a basic operation procedure of the control device for an internal combustion engine of the present invention will be described with reference to a flowchart of FIG. Incidentally, the control device for the internal combustion engine of the present invention,
This is applied to an internal combustion engine provided with an electronically controlled throttle valve device.

In the control device for an internal combustion engine of the present invention, first,
As shown in step 201, the rotational speed N of the internal combustion engine
e and the operation amount of the accelerator pedal (the depression amount θ of the accelerator pedal (indicated by an angle or 0 to 100%)) are detected and read into the control device. In the control unit,
As shown in step 202, the torque (required torque) to be generated by the internal combustion engine in this state is calculated based on the accelerator pedal depression amount θ and the engine speed Ne. When calculating the required torque, the engine speed, the accelerator pedal depression amount, which is actually measured in advance according to the engine performance,
In this state, the necessary torque required for the engine is calculated, and a three-dimensional map of the required torque is stored in a memory in the control device. The detected values of the accelerator pedal depression amount θ and the engine speed Ne that are not on the map can be calculated by interpolating the map values of the three-dimensional map. Therefore, for example, when the engine speed Ne is 200
At 0 rpm, assuming that the accelerator pedal depression amount θ is 40%, the required torque value can be calculated as T from this three-dimensional map.

When the value of the required torque is calculated in this way, as shown in step 203, the electronic control unit in the control device calculates the electronic torque based on the calculated value T of the required torque and the engine speed Ne at that time. A throttle valve opening (required throttle valve opening) to be set in the control throttle valve device is calculated. When calculating the required throttle valve opening, a three-dimensional map of the throttle valve opening actually measured according to the engine performance, the engine speed at that time, and the engine torque is stored in a memory in the control device. To memorize,
By interpolating the map value of the three-dimensional map from the calculated value T of the required torque and the detected value of the engine speed Ne, it is possible to calculate the throttle valve opening to be set in the electronically controlled throttle valve device. Thus, for example, step 20
When the required torque calculated in 2 is T, this torque is calculated based on 2000 rpm which is the value of the engine speed Ne at this time.
From the dimensional map, the value of the required throttle valve opening can be calculated as 50%.

The value of the required throttle valve opening calculated as described above is output from the control device to the electronic control throttle valve device as shown in step 204, and the throttle valve opening of the electronic control throttle valve device is Is controlled to this value. The control device for an internal combustion engine of the present invention that operates as described above can calculate the required throttle valve opening from the required torque corresponding to the amount of depression of the accelerator pedal at a predetermined engine speed. Even when the torque changes due to the operation of the intake air amount device, the VVT device, or the like, the torque can be smoothly changed according to the depression amount of the accelerator pedal and the engine speed.

FIG. 3 shows a schematic configuration of an electronically controlled fuel injection type internal combustion engine equipped with a variable intake air amount apparatus to which the present invention is applied, and control of the present invention in the electronically controlled fuel injection type internal combustion engine. This will be described with reference to FIG.
FIG. 3 schematically shows an electronic control fuel injection type multi-cylinder internal combustion engine 1 provided with the control device for an internal combustion engine of the present invention as an embodiment. In FIG. 3, an electronically controlled throttle valve device 50 is provided in the intake passage 2 of the internal combustion engine 1 downstream of an air cleaner (not shown). The electronically controlled throttle valve device 50 is provided at one end of a shaft of the throttle valve 3, the actuator 4 for driving the throttle valve 3, and at the other end of the shaft of the throttle valve 3. And a throttle opening sensor 5 for detecting the opening. Therefore, the throttle valve 3 of this embodiment is driven to be opened and closed by the actuator 4.

In an intake passage 2 before and after the throttle valve 3, an idle speed control (hereinafter referred to as ISC) passage 20 for adjusting an idle speed when the throttle valve 3 is closed is bypassed. It is provided. And in the middle of this ISC passage 20,
ISC for adjusting the amount of intake air flowing through ISC passage 20
A control valve 21 is provided.

An intake passage length variable device 30 as a variable intake air amount device is provided in the intake passage 2 downstream of the throttle valve 3, and an intake pressure is provided upstream (or inside) of the intake passage length variable device 30. A pressure sensor 7 for detecting the temperature and an intake air temperature sensor (not shown) for detecting the temperature of the intake air are provided. The amount of intake air to the internal combustion engine 1 is calculated from the detected value of the pressure sensor 7, and is corrected by the detected value of the intake air temperature sensor.

As shown in FIG. 4, the variable intake passage length device 30 includes a cylindrical fixed case 31 and a cylindrical rotating case 32 concentrically arranged in the fixed case 31. In the case of a four-cylinder internal combustion engine, the annular space between the fixed case 31 and the rotating case 32 is axially divided into four by three substantially C-shaped partition walls 33 to form four annular passages 34. ing. One end of each annular passage 34 is an end wall 35
, And the other end of each annular passage 34 is connected to the corresponding intake manifold 27.

A slit 36 extending in the axial direction is formed on the outer peripheral wall surface of the rotating case 32, and the internal space of the rotating case 32 is formed through the slit 36 through each annular passage 3.
It communicates with 4. One end in the axial direction of the internal space of the rotating case 32 is connected to the intake passage 2 containing the electronically controlled throttle valve 3, and the other end is connected to the drive shaft 3.
7 is attached. And this drive shaft 37 is
For example, the rotation is controlled by the motor 38.

Therefore, the intake air having passed through the throttle valve 3 in the intake passage 2 once enters the internal space of the rotating case 31,
As shown by white arrows in FIG. 3, the fluid flows into each annular passage 34 through the slit 36. Then, it flows through the annular passage 34 and enters the intake manifold 6, and flows into the combustion chamber 23 by opening the intake valve 22. In this case, in FIG. 3, when the rotating case 32 rotates clockwise, the annular passage 3 is rotated.
The length of the annular passage 34 becomes shorter as the length of the annular passage 34 increases, and when the counterclockwise rotation is performed, the length of the annular passage 34 becomes shorter.

A fuel injection valve 8 for supplying pressurized fuel from a fuel supply system to an intake port is provided for each cylinder on the downstream side of the intake passage length varying device 30. The output of the throttle opening sensor 5, the output of the pressure sensor 7, and
The output of the intake air temperature sensor is input to an ECU (engine control unit) 10 incorporating a microcomputer.

The fuel injected from the fuel injection valve 8 is mixed with the intake air and enters the combustion chamber 23 when the intake valve 22 is opened.
The fuel is ignited by the ignition plug 25 in a state compressed by the piston 24 and burns, and the exhaust gas after the combustion is discharged to the exhaust passage 12 by the piston 24 when the exhaust valve 26 is opened. The spark plug 25 is sparked by an igniter 16 as a current interrupting device and an ignition coil 17 as a booster, and the ignition timing of the spark plug 25 is determined by a signal from the ECU 10 to the igniter 16.

On the other hand, a coolant temperature sensor 11 for detecting the temperature of the coolant is provided in the coolant passage 9 of the cylinder block of the internal combustion engine 1. The water temperature sensor 11 generates an analog voltage electric signal according to the temperature of the cooling water. The exhaust passage 12 contains three harmful components HC and C in the exhaust gas.
A three-way catalytic converter (not shown) for purifying O and NOx at the same time is provided. An O ₂ sensor 13 which is a kind of air-fuel ratio sensor is provided in an exhaust passage 12 on the upstream side of the catalytic converter. I have. The O ₂ sensor 13 generates an electric signal according to the concentration of the oxygen component in the exhaust gas. The outputs of the water temperature sensor 11 and the O ₂ sensor 13 are
Is input to

The ECU 10 further includes an accelerator opening signal indicating an accelerator depression amount from an accelerator depression amount sensor 15 attached to the accelerator pedal 14 and a reference crank angle signal from a crank angle sensor 19 attached to the distributor. G and a signal CA for each predetermined angle are input. The engine speed Ne is obtained by measuring the interval (time) of the predetermined angle signal CA.

In the above configuration, when a key switch (not shown) is turned on, the ECU 10 is energized to start a program, and the output from each sensor is taken in.
Control of the actuator 4 for opening and closing the throttle valve 3, the fuel injection valve 8, or other actuators is started. The ECU 10 includes an A / D converter for converting an analog signal from various sensors into a digital signal, and an input / output interface 10 for input and output of digital signals from various sensors and signals for driving each actuator.
1. A CPU 102 for performing arithmetic processing, a memory such as a ROM 103 for temporarily storing a control program and a control map and a RAM 104 for temporarily storing data, a clock 105, and the like are provided. These are interconnected by a bus 106. ing. Since the configuration of the ECU 10 is publicly known, further description is omitted.

Here, in the electronically controlled fuel injection type internal combustion engine 1 constructed as shown in FIG. 3 and FIG. 4, the present invention is applied to the case where the intake passage length varying device 30 is operated to easily change the engine torque. The control will be described. FIG. 5 shows the engine speed Ne and the engine torque for each throttle valve opening (angle) in the electronically controlled fuel injection type internal combustion engine 1 provided with the intake passage length varying device 30 described with reference to FIGS. FIG. 4 is a characteristic diagram showing the relationship of FIG. As can be seen from this figure, in the electronically controlled fuel injection type internal combustion engine 1 provided with the intake passage length varying device 30, at a predetermined throttle valve opening, the engine torque decreases as the engine speed increases. In such a case, the driver may feel that the engine performance has deteriorated.

Therefore, in this embodiment, in the electronically controlled fuel injection type internal combustion engine 1 having the intake passage length varying device 30, the driver can improve the engine performance for a predetermined accelerator pedal depression amount (angle). The appropriate engine torque (the above-described required torque) that does not cause a sense of incongruity is set to the engine speed Ne at that time.
Set by calculating according to. FIG. 6 shows an example of the characteristics of the required torque according to the accelerator pedal depression amount and the engine speed Ne.

In this embodiment, the required torque characteristic according to the accelerator pedal depression amount and the engine speed Ne shown in FIG. 6 is stored in the ROM of the ECU 10 in the form of a three-dimensional map.
103. The characteristics of the engine torque corresponding to the throttle opening and the engine speed Ne shown in FIG. 5 are also stored in the ROM 103 of the ECU 10 in the form of a three-dimensional map.

Now, suppose that the driver depresses the accelerator pedal 14, and when the depression amount (angle) becomes 30 °, the rotation speed of the engine becomes 3200 rpm. in this case,
The depression amount of the accelerator pedal 14 operated by the driver is extracted as an electric signal by the accelerator depression amount sensor 15, and 3200 rpm of the engine speed is detected, and these are input to the ECU 10 which is the control device of the internal combustion engine 1. In the ECU 10, the value of the torque required for the internal combustion engine 1 is calculated to be 235 Nm from the three-dimensional map having the characteristics shown in FIG.

Thus, the required torque value of 235 Nm
Is calculated, the ECU 10 calculates the required torque value 23
Using 5Nm and the value of the engine speed 3200 rpm at this time, a throttle opening to be set for the electronic control throttle valve 3 (the required throttle opening described above) is calculated from a three-dimensional map having the characteristics of FIG. I do. If there is no exact value, the necessary throttle opening is calculated by interpolation calculation.
In this example, the required torque is 235 Nm and the engine speed is 320
The required throttle valve opening corresponding to 0 rpm is calculated as 40 °.

The calculated value of the required throttle valve opening of 40 ° is output from the ECU 10 to the actuator 4 of the electronically controlled throttle valve device 50, and the opening of the throttle valve 3 is controlled to 40 °. In this case, in a conventional electronically controlled internal combustion engine to which the present invention is not applied, for example, assuming that the depression amount of the accelerator pedal and the throttle valve opening correspond one-to-one, the depression amount of the accelerator pedal becomes 30.
In the case of °, the opening of the throttle valve 3 of the electronic control throttle valve device 50 is also set to 30 °. Therefore, when the variable intake passage length device 30 is operated and the engine torque is reduced, the engine torque is reduced. People will feel it.

With this control, in this embodiment, the electronic control throttle valve device 50 sets the throttle valve opening for producing the required torque according to the predetermined accelerator pedal depression amount and the engine speed at that time. Can be. As a result, in the internal combustion engine 1 provided with the variable intake passage length device 30, even when the torque of the engine changes due to the operation of the variable intake passage length device 30, the engine torque is determined by the depression amount of the accelerator pedal and the engine speed at that time By making the change smoothly in accordance with Ne, the required throttle valve opening which does not cause the driver to feel uncomfortable can be obtained by map control.

Next, as another embodiment to which the present invention is applied, a schematic configuration of an electronically controlled fuel injection type internal combustion engine equipped with a variable valve timing device, and an embodiment of the electronically controlled fuel injection type internal combustion engine will be described. The control of the invention will be described with reference to FIGS. FIG. 7 schematically shows another embodiment of an electronically controlled fuel injection type multi-cylinder internal combustion engine 1 including a control device for an internal combustion engine according to the present invention. The internal combustion engine 1 shown in FIG. 7 is different from the internal combustion engine 1 shown in FIG. 3 in that the intake passage length varying device 30 is replaced by the surge tank 6, and the intake valve 22 or the exhaust valve 2
6 is provided with a variable valve timing device 40 for changing the opening / closing timing according to the operating state of the engine. Therefore, in the internal combustion engine 1 shown in FIG. 7, the same components as those of the internal combustion engine 1 described with reference to FIG. 3 are denoted by the same reference numerals, and the description thereof will be omitted.

In the intake passage 2 of the internal combustion engine 1 shown in FIG.
A surge tank 6 is provided downstream of the electronic control throttle valve 3 described in FIG. 3 and the ISC passage 20 that bypasses the electronic control throttle valve 3 instead of the intake passage length varying device 30. Inside the surge tank 6, a pressure sensor 7 for detecting the pressure of the intake air and an intake air temperature sensor 18 for detecting the temperature of the intake air
Is provided. The output of the pressure sensor 7 and the output of the intake air temperature sensor 18 are input to the ECU 10. The downstream side of the surge tank 6 is connected to the intake manifold 27 of each cylinder, and pressurized fuel corresponding to the amount of intake air detected by the pressure sensor 7 is supplied to the intake manifold 27 for each cylinder. A fuel injection valve 8 for supplying is provided.

The combustion chamber 23 communicates with the intake passage 2 by opening the intake valve 22, and communicates with the exhaust passage 12 by opening the exhaust valve 26. The opening / closing timing of the intake valve 22 and the exhaust valve 26 is controlled by a variable valve timing device 40. The variable valve timing device 40 of this embodiment can perform retard control of the closing timing of the exhaust valve 26 and advance control of the opening timing of the intake valve 22, and the intake valve can be controlled before the exhaust valve 26 closes. It is possible to control the period (valve overlap amount) during which both are open at the same time when 22 is open. The variable valve timing device 40 is controlled by the ECU 21. Since the configuration of the variable valve timing device 40 is the same as that described in Japanese Patent Application Laid-Open No. 9-60535 filed by the present applicant, the description thereof is omitted here.

Here, in the electronically controlled fuel injection type internal combustion engine 1 configured as shown in FIG. 7, the control of the present invention in the case where the variable valve timing device 40 operates to easily change the engine torque will be described. . FIG. 8 shows the relationship between the engine speed Ne and the engine torque for each throttle valve opening (angle) in the electronically controlled fuel injection type internal combustion engine 1 provided with the variable valve timing device 40 described in FIG. It is a characteristic diagram. As can be seen from this figure, in the electronically controlled fuel injection type internal combustion engine 1 equipped with the variable valve timing device 40, the intake valve 22
When the opening / closing timing of the exhaust valve 26 is changed, the torque of the engine may decrease as the engine speed increases. In such a case, the driver feels that the engine performance has decreased. Sometimes.

Therefore, in this embodiment, in the electronically controlled fuel injection type internal combustion engine 1 provided with the variable valve timing device 40, the required torque for a predetermined accelerator pedal depression amount (angle) is determined. It is set according to the rotation speed Ne. FIG. 9 shows an example of such a characteristic of the required torque according to the accelerator pedal depression amount and the engine speed Ne.

In this embodiment, the required torque characteristic corresponding to the accelerator pedal depression amount and the engine speed Ne shown in FIG. 9 is stored in the ROM of the ECU 10 in the form of a three-dimensional map.
103. The characteristics of the engine torque corresponding to the throttle opening and the engine speed Ne shown in FIG. 8 are also stored in the ROM 103 of the ECU 10 in the form of a three-dimensional map.

Now, suppose that the driver depresses the accelerator pedal 14, and when the depression amount (angle) becomes 25 °, the engine speed becomes 4000 rpm. in this case,
The depression amount of the accelerator pedal 14 operated by the driver is extracted as an electric signal by the accelerator depression amount sensor 15, and 4000 rpm of the engine speed is detected, and these are input to the ECU 10. In the ECU 10, R
The value of the torque required for the internal combustion engine 1 is calculated as 150 Nm from the three-dimensional map having the characteristics shown in FIG.

Thus, the required torque value of 150 Nm
Is calculated, the ECU 10 calculates the required torque value 15
The required throttle opening of the electronic control throttle valve 3 is calculated from the three-dimensional map having the characteristics shown in FIG. 8 using 0 Nm and the value of the engine speed 4000 rpm at this time. If there is no exact value, the necessary throttle opening is calculated by interpolation calculation. In this example, the required torque is 150 Nm,
The required throttle valve opening corresponding to the engine speed of 4000 rpm is calculated to be 55 °.

The calculated value of the required throttle valve opening of 55 ° is output from the ECU 10 to the actuator 4 of the electronically controlled throttle valve device 50, and the opening of the throttle valve 3 is controlled to 55 °. In this case, in a conventional electronically controlled internal combustion engine to which the present invention is not applied, for example, assuming that the depression amount of the accelerator pedal and the throttle valve opening correspond one-to-one, the depression amount of the accelerator pedal becomes 25.
The opening degree of the throttle valve 3 of the electronically controlled throttle valve device 50 is also set at 25 ° when the variable valve timing device 40 is operated and the engine torque is reduced. Will be felt.

With this control, the electronic control throttle valve device 50 also sets the throttle valve opening for producing the required torque according to the predetermined accelerator pedal depression amount and the engine speed at that time in this embodiment. Can be. As a result, in the internal combustion engine 1 provided with the variable valve timing device 40, even when the torque of the engine changes due to the operation of the variable valve timing device 40, the required throttle valve opening degree that the driver does not feel uncomfortable is obtained by the map control. be able to.

As described above, in the control device for an internal combustion engine of the present invention, the torque required for the engine at that time is calculated from the accelerator depression amount and the engine speed, and the calculated required torque and the engine speed at that time are calculated. Accordingly, the required throttle valve opening for obtaining the required torque is calculated, and the electronically controlled throttle valve device is controlled based on the calculated value of the required throttle valve opening. Can be smoothly controlled in accordance with the amount of depression of the accelerator pedal and the engine speed at that time, even when is mounted on the internal combustion engine.

[0042]

As described above, according to the control apparatus for an internal combustion engine of the present invention, in an electronically controlled fuel injection type internal combustion engine equipped with an electronically controlled throttle valve device, a variable intake air amount device, a VVT device, etc. Even if a factor for changing the torque of the engine is provided, there is an effect that the torque of the engine with respect to the depression amount of the accelerator pedal can be smoothly changed according to the engine speed at that time.

[Brief description of the drawings]

FIG. 1 is a diagram showing the principle configuration of a control device for an internal combustion engine of the present invention.

FIG. 2 is a flowchart showing the operation of the control device for an internal combustion engine of the present invention.

FIG. 3 is a configuration diagram showing the overall configuration of an embodiment of an electronically controlled fuel injection type internal combustion engine provided with the control device for an internal combustion engine of the present invention.

FIG. 4 is a sectional view of an intake passage length varying device provided in the internal combustion engine of FIG. 3;

FIG. 5 is a characteristic diagram obtained by actually measuring a relationship among a throttle valve opening, an engine speed, and an engine torque in the internal combustion engine of FIG. 3;

6 is a characteristic diagram showing a relationship between an accelerator pedal depression amount and an engine speed for obtaining a required torque in the internal combustion engine of FIG. 3;

FIG. 7 is a configuration diagram showing the overall configuration of another embodiment of an electronically controlled fuel injection type internal combustion engine provided with the control device for an internal combustion engine of the present invention.

8 is a characteristic diagram obtained by actually measuring a relationship among a throttle valve opening, an engine speed, and an engine torque in the internal combustion engine of FIG. 7;

9 is a characteristic diagram showing a relationship between an accelerator pedal depression amount and an engine speed for obtaining a required torque in the internal combustion engine of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine 2 ... Intake passage 3 ... Throttle valve 4 ... Actuator 5 ... Throttle opening degree sensor 7 ... Pressure sensor 8 ... Fuel injection valve 10 ... ECU (Engine control unit) 14 ... Accelerator pedal 15 ... Accelerator depression amount sensor 19 ... Crank angle sensor 22 ... Intake valve 26 ... Exhaust valve 27 ... Exhaust manifold 30 ... Variable intake passage length device 40 ... Variable valve timing device 50 ... Electronically controlled throttle valve device

Claims (2)

[Claims] 1. A control device for an internal combustion engine provided with an electronically controlled throttle valve device, comprising: an accelerator pedal operation amount detection means for detecting an accelerator pedal operation amount; and an engine speed detection device for detecting an engine speed. Detecting means, required torque calculating means for calculating a torque to be generated by the internal combustion engine based on the detected value of the accelerator pedal operation amount and the engine speed at that time, the calculated required torque, and the engine speed at that time A throttle valve opening calculating means for calculating a throttle valve opening to be set in the electronically controlled throttle valve device on the basis of the calculated throttle valve opening. A control device for an internal combustion engine, wherein the control signal is input to a control unit to control a throttle valve opening. 2. The control device for an internal combustion engine according to claim 1, wherein the required torque calculating means is based on a three-dimensional map of an accelerator operation amount, an engine speed, and a required torque set in advance. The throttle valve opening calculating means calculates the required torque at which the electronic control throttle is to be generated based on a three-dimensional map of a preset engine speed, the calculated required torque and the required throttle valve opening. A control device for an internal combustion engine, which calculates a required throttle valve opening to be set in a valve device.