JP2003056353A - Supercharge pressure control device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a supercharge pressure from rising higher than required at low throttle opening, to reduce fuel consumption, to prevent surging of a compressor, and to maintain output properties with respect to variation of a throttle opening gently and smoothly. SOLUTION: This supercharge pressure control device for internal combustion engine is provided with a control valve operation control means for controlling opening and closing of a waste gate valve by operating a waste gate valve control valve based on a fundamental duty value set by a fundamental duty value setting means so that the supercharge pressure of a supercharger becomes a target supercharge pressure. A throttle opening detecting means is provided for detecting a throttle opening of a throttle valve of the internal combustion engine. A correction factor setting means is provided for setting a correction factor based on the throttle opening detected by the throttle opening detecting means. A fundamental duty value correcting means is provided for correcting the fundamental duty value by the correction factor set by the correction factor setting means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supercharging pressure control device for an internal combustion engine, and more particularly, it can prevent the supercharging pressure from rising too much at a low throttle opening, thereby reducing fuel consumption. In particular, the present invention relates to a supercharging pressure control device for an internal combustion engine, which can prevent surging of a compressor and make output characteristics moderate and smooth with respect to changes in throttle opening.

[0002]

2. Description of the Related Art An internal combustion engine mounted on a vehicle or the like is provided with a supercharger for driving a compressor provided in an intake passage by a turbine provided in an exhaust passage of the internal combustion engine, depending on an engine speed and a throttle opening. Some superchargers are provided with a supercharging pressure control device that controls the supercharging pressure of the supercharger so that the supercharging pressure becomes the target supercharging pressure.

This supercharging pressure control device is provided with an exhaust gate passage in an exhaust bypass passage that bypasses the turbine of the supercharger and communicates with the exhaust passage, and an actuator that opens and closes the waste gate valve. A waste gate valve control valve is provided which adjusts the opening of the waste gate valve by allowing the boost pressure in the intake passage on the compressor downstream side that is operated and introduced into the actuator to escape to the intake passage on the compressor upstream side.

This supercharging pressure control device is provided with engine speed detecting means, pressure detecting means, basic duty value setting means, and control valve operation control means. The boost pressure control device
As shown in FIG. 6, when the control is started (300), the engine speed detecting means detects the engine speed Ne and the pressure detecting means detects the boost pressure Pm of the surge tank (302). And a supercharging pressure Pm from the map, the basic duty value setting means sets a basic duty value D (304), and the control valve operation control means operates the waste gate valve control valve based on the basic duty value D to perform supercharging. Boost pressure Pm of machine
The waste gate valve is controlled to be opened and closed so as to become the target supercharging pressure Pt to end (306).

As such a supercharging pressure control device for an internal combustion engine, Japanese Patent Laid-Open Nos. 5-98980 and 6-221 have been disclosed.
There is one disclosed in Japanese Patent Publication No. 174.

The one disclosed in JP-A-5-98980 is provided with a main / sub turbocharger, an exhaust bypass valve driven by a diaphragm actuator is provided downstream of the sub turbocharger, and is mainly used in a low intake air amount range. Opening of the exhaust bypass valve by supercharging only the turbocharger and bleeding the supercharged air introduced into the diaphragm actuator to the outside via the duty-controlled solenoid valve when only the main turbocharger is supercharging In the supercharging pressure control device that controls the supercharging pressure by controlling the above, the upper limit value of the duty ratio of the solenoid valve that controls the opening of the exhaust bypass valve according to the throttle opening signal from the throttle opening detection sensor is regulated. However, the duty ratio may be set to an appropriate value in consideration of the throttle opening.

Japanese Patent Application Laid-Open No. 6-221174 discloses that the control pressure supplied to the actuator of the waste gate valve for adjusting the supercharging pressure is duty-controlled using a duty solenoid valve to open the waste gate valve. In the supercharging pressure control device that controls the supercharging pressure by adjusting the degree, the output control amount for the waste gate valve is limited between the upper limit value and the lower limit value, and a target that deviates from the operating range of the waste gate valve. When the boost pressure is set, the feedback control amount of the duty solenoid valve is regulated to the upper limit value or the lower limit value of the output control amount.

[0008]

By the way, the supercharging pressure control device for an internal combustion engine introduces the supercharging pressure Pcout of the compressor outlet pressure to the actuator and sets it from the map of the engine speed Ne and the supercharging pressure Pm. The waste gate valve control valve, which is duty-controlled based on the basic duty value D, releases the boost pressure Pm introduced into the actuator to the intake passage on the upstream side of the compressor to adjust the opening of the waste gate valve. The supercharging pressure Pm is controlled so as to become the target supercharging pressure Pt.

When the duty value is 0%, the waste gate valve control valve is fully closed to introduce all of the boost pressure Pcout of the compressor outlet pressure into the actuator, and when the boost pressure Pcout reaches the actuator set pressure. The actuator opens the waste gate valve to release the exhaust gas and control so that the boost pressure does not rise too much.

The amount of relief of the supercharging pressure by the waste gate valve control valve for letting the supercharging pressure introduced into the actuator escape to the intake passage on the upstream side of the compressor is increased as the duty value increases, and the outlet pressure immediately downstream of the compressor is increased. Even if Pcout rises, the waste gate valve becomes difficult to open, and the boost pressure Pm increases above the actuator set pressure. Basically, as shown in FIG.
When the duty value Duty increases, the boost pressure Pm also increases.

However, when the waste gate valve control valve is duty-controlled based on the basic duty value D to control the supercharging pressure Pm, the supercharging pressure Pm is set to the full supercharging pressure in order to perform stable control. Even when it is relatively smaller than the above, some duty is added. Further, in order to improve the transient characteristics, it is better to give a certain large duty even when the boost pressure Pm is low.

Thus, when the duty is added to some extent even when the supercharging pressure Pm is relatively smaller than the full supercharging pressure, when the throttle opening Thr is relatively small, the supercharging pressure Pm is also compared. Even if it is relatively small, the outlet pressure Pcout immediately downstream of the compressor will be higher than the actuator set pressure, and the pressure will be close to the full boost pressure.

In such a state, since the supercharger performs extra work, there is an inconvenience that the fuel consumption increases, and even though the throttle opening is small and the air flow rate is small, the downstream side of the compressor. There is a disadvantage that the compressor causes surging due to the increase in the pressure of the, and further, the change of the output characteristics with respect to the change of the throttle opening at the time of the low throttle opening becomes steep and stepped, which deteriorates the drivability. There is an inconvenience.

[0014]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides a compressor for a supercharger in an intake passage of an internal combustion engine and drives the compressor in an exhaust passage of the internal combustion engine. A turbine of the feeder is provided, an exhaust bypass passage that bypasses the turbine and communicates with the exhaust passage is provided, a waste gate valve that opens and closes the exhaust bypass passage is provided, and supercharging introduced from the intake passage downstream of the compressor By providing an actuator that is operated by pressure to open and close the waste gate valve, and let the supercharging pressure of the intake passage on the compressor downstream side, which is operated by the duty value and introduced into the actuator, escape to the intake passage on the compressor upstream side. A waste gate valve control valve that adjusts the opening of the waste gate valve The engine speed detecting means for detecting the engine speed of the internal combustion engine is provided, and the pressure detecting means for detecting the pressure in the intake passage on the compressor downstream side is provided, and the engine speed detected by the engine speed detecting means. And a basic duty value setting means for setting a basic duty value from the supercharging pressure of the intake passage on the compressor downstream side detected by the pressure detecting means, and based on the basic duty value set by the basic duty value setting means. A supercharging pressure control device for an internal combustion engine, which is provided with control valve operation control means for operating the waste gate valve control valve to open / close the waste gate valve so that the supercharging pressure of the supercharger becomes a target supercharging pressure. A throttle opening detecting means for detecting the throttle opening of the throttle valve of the internal combustion engine. Correction coefficient setting means for setting a correction coefficient based on the throttle opening detected by the throttle opening detection means, and basic duty value correction means for correcting the basic duty value with the correction coefficient set by the correction coefficient setting means. It is characterized by that.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A supercharging pressure control system for an internal combustion engine according to the present invention operates a waste gate valve control valve based on a basic duty value so that a supercharging pressure of a supercharger becomes a target supercharging pressure. In a supercharging pressure control device for an internal combustion engine, which is provided with a control valve operation control means for controlling the opening and closing of a waste gate valve, a throttle opening detection means for detecting a throttle opening of a throttle valve of the internal combustion engine is provided. The correction coefficient setting means for setting the correction coefficient based on the throttle opening detected by the means, and the basic duty value correction means for correcting the basic duty value by the correction coefficient set by the correction coefficient setting means are provided. The basic duty value can be corrected so that the boost pressure does not rise too much when the throttle opening is small and low. During low and medium throttle opening can be corrected basic duty value so that the change in the output characteristics with respect to the change of the throttle opening becomes gentle.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment of the present invention. In FIG. 5, 2 is an internal combustion engine mounted on a vehicle (not shown), 4 is a cylinder block, 6 is a cylinder head, 8 is a head cover, and 10 is a combustion chamber.

The internal combustion engine 2 sequentially connects an air cleaner 12, an intake pipe 14, a throttle body 16, a surge tank 18 and an intake manifold 20 as an intake system, and has an intake passage 22 communicating with the combustion chamber 10. A throttle valve 24 is provided in the intake passage 22 of the throttle body 16.
Is provided. Further, the internal combustion engine 2 has an exhaust manifold 32, an exhaust pipe 28, and a catalytic converter 30 sequentially connected as an exhaust system, and an exhaust passage 32 communicating with the combustion chamber 10 is provided.

The internal combustion engine 2 is provided with a supercharger 34. The supercharger 34 is provided with a compressor 36 in the middle of the intake pipe 14 and a turbine 38 in the middle of the exhaust pipe 28. Further, the internal combustion engine 2 is provided with an intercooler 40 in the intake pipe 14 on the downstream side of the compressor 36.

The supercharger 34 is provided with an exhaust bypass passage 42 that bypasses the turbine 38 and communicates with the exhaust passage 32, a waste gate valve 44 that opens and closes the exhaust bypass passage 42, and an intake passage downstream of the compressor 36. Two
Operated by boost pressure of 2 and waste gate valve 4
An actuator 46 for opening and closing 4 is provided, and a waste gate valve control valve 48 that is operated according to a duty value to adjust the opening degree of the waste gate valve 44 is provided.

The actuator 46 includes a compressor 3
6 The other end side of the supercharging pressure introducing passage 50, which communicates one end side with the intake passage 22 on the downstream side, is provided so as to communicate with each other. In the middle of the supercharging pressure introducing passage 50, the other end of the supercharging pressure relief passage 52, which communicates with one end of the intake passage 22 upstream of the compressor 36, is provided. A wastegate valve control valve 48 is provided in the supercharging pressure relief passage 52. The waste gate valve control valve 48 is operated by the duty value, and the supercharging pressure of the intake passage 22 on the downstream side of the compressor 36, which is introduced into the actuator 46, is released to the upstream side of the compressor 36, so that the opening degree of the waste gate valve 44 is increased. Adjust.

Further, the internal combustion engine 2 is provided with an air bypass passage 54 communicating the upstream and downstream intake passages 22 of the compressor 36, an air bypass valve 56 opening and closing the air bypass passage 54, and opening and closing the air bypass valve 56. An actuator 58 that operates is provided, a control pressure guiding passage 60 that connects the actuator 58 and the intake passage 22 on the downstream side of the compressor 36 is provided, and an air bypass valve control valve 62 is provided in the control pressure introducing passage 60.

The air bypass valve control valve 62 opens the port 60 of the actuator 58 to the atmosphere when the throttle valve 24 is rapidly closed, and opens the air bypass passage 54 by opening the air bypass valve 56 to open the air bypass passage 54. The operation is controlled so as to prevent surging.

The internal combustion engine 2 is provided with an ignition coil 64 attached to the head cover 8. Further, the internal combustion engine 2 is provided with a first blow-by gas passage 68 that communicates the inside of the head cover 8 with the intake passage 22 of the surge tank 18 via the PCV valve 66, and the inside of the head cover 8 and the intake passage 22 immediately downstream of the air cleaner 12 are connected to each other. The second blow-by gas passage 70 that communicates with each other is provided.

The internal combustion engine 2 is provided with a fuel injection valve 72 in the intake manifold 20 for injecting fuel toward the combustion chambers 10. The fuel injection valve 72 is connected to a fuel tank 78 via a fuel distribution pipe 74 and a fuel supply passage 76. Inside the fuel tank 78, a fuel pump 80, a fuel filter 82, and a fuel pressure adjusting section 84 are provided.

The fuel in the fuel tank 78 pumped by the fuel pump 80 has its dust removed by the fuel filter 82, the pressure thereof is adjusted by the fuel pressure adjusting portion 84, and the fuel is supplied to the fuel supply passage 76. It is distributed and supplied to the fuel injection valve 72 of each combustion chamber 10. The surplus fuel whose pressure is adjusted by the fuel pressure adjusting unit 84 is
It is returned to the inside of the fuel tank 78.

The fuel tank 78 communicates with one end of an evaporation passage 88 via a two-way check valve 86. The other end of the evaporation passage 88 communicates with the canister 90. One end side of the purge passage 92 communicates with the canister 90. The other end of the purge passage 92 communicates with the intake passage 22 of the throttle body 16. A purge control valve 94 for adjusting the purge amount is provided in the middle of the purge passage 92.

The internal combustion engine 2 is provided with an idle air passage 96 that bypasses the throttle valve 24 and connects the intake passage 22 of the throttle body 16 and the intake passage 22 of the surge tank 18. In the middle of the idle air passage 96,
An idle air amount control valve 98 for adjusting the idle air amount is provided.

The internal combustion engine 2 is provided with a crank angle sensor 100 that detects the crank angle and also functions as engine speed detecting means to detect the engine speed Ne. A pressure sensor 102 as a pressure detecting means for detecting the pressure as the supercharging pressure Pm is provided, and a throttle opening sensor 104 as a throttle opening detecting means for detecting the throttle opening Thr of the throttle valve 24 is provided. A water temperature sensor 106 for detecting the cooling water temperature is provided, an intake air temperature sensor 108 for detecting the intake air temperature of the internal combustion engine 2 is provided, an O2 sensor 110 for detecting the oxygen concentration in the exhaust gas is provided, and knocking of the internal combustion engine 2 is detected. A knock sensor 112 is provided.

The waste gate valve control valve 48, the air bypass valve control valve 62, and the ignition coil 6
4, fuel injection valve 72, fuel pump 80, purge control valve 9
4, the idle air amount control valve 98, and the crank angle sensor 10
0, pressure sensor 102, throttle opening sensor 104, water temperature sensor 106, intake air temperature sensor 108, O2 sensor 1
10 and the knock sensor 112, the boost pressure control device 114
Is connected to the control means 116 constituting the above. A battery 122 is connected to the control means 116 via a main switch 118 and a fuse 120.

The control means 116 is provided with a basic duty value setting means 124 and a control valve operation control means 126. As shown in FIG. 2, the basic duty value setting means 124 determines the basic duty value from the engine speed Ne detected by the crank angle sensor 100 and the boost pressure Pm of the intake passage 22 downstream of the throttle valve 24 detected by the pressure sensor 102. The duty value D is set. Control valve operation control means 126
Is the waste gate valve control valve 4 based on the basic duty value D set by the basic duty value setting means 124.
8 is operated.

The supercharging pressure control device 114 has a control means 116.
The basic duty value setting means 124 sets a basic duty value D from the engine speed Ne detected by the crank angle sensor 100 and the supercharging pressure Pm of the intake passage 22 downstream of the throttle valve 24 detected by the pressure sensor 102. The control valve operation control means 126 operates the waste gate valve control valve 48 based on the basic duty value D set by the basic duty value setting means 124 so that the supercharging pressure Pm of the supercharger 34 becomes the target supercharging pressure Pt. The waste gate valve 44 is controlled to open and close as described above.

The supercharging pressure control device 114 has a control means 1
16, a correction coefficient setting means 128 and a basic duty value correction means 130 are provided. Correction coefficient setting means 1
28 is a throttle opening sensor 104, as shown in FIG.
The correction coefficient K is set based on the throttle opening degree Thr detected by. The correction coefficient K is set to a value that gradually approaches "1" from "0" from the low throttle opening Thr to the middle throttle opening, and is set to a value that becomes "1" when the high throttle opening Thr is the set value S or more. ing. The basic duty value correction means 130 uses the correction coefficient K set by the correction coefficient setting means 128 to set the basic duty value setting means 12
The basic duty value D set in 4 is corrected. The basic duty value D corrected by the correction coefficient K becomes a small value at the low throttle opening Thr even with the same supercharging pressure.
The value gradually increases as the throttle opening Thr increases, and is set to a value that increases in proportion to the boost pressure Pm when the throttle opening Thr is high.

As a result, the supercharging pressure control device 114 has the engine speed N detected by the crank angle sensor 100 by the basic duty value setting means 124 of the control means 116.
e and the throttle valve 24 detected by the pressure sensor 102
The basic duty value D is set from the supercharging pressure Pm of the downstream intake passage 22, and the throttle opening Th detected by the throttle opening sensor 104 by the correction coefficient setting means 128.
A correction coefficient K is set based on r, and the basic duty value correction means 130 corrects the basic duty value D by the correction coefficient K set by the correction coefficient setting means 128 to obtain a corrected basic duty value D = D * K. The control valve operation control means 126 operates the waste gate valve control valve 48 based on the corrected basic duty value D = D * K corrected by the basic duty value correction means 130, and the supercharging pressure Pm of the supercharger 34. The waste gate valve 44 is controlled to open and close so that the target boost pressure Pt becomes.

Next, the operation of this embodiment will be described.

The supercharging pressure control device 114 has a control means 116.
As shown in FIG. 1, when the control starts, (2
00), the crank angle sensor 100 detects the engine speed Ne, and the pressure sensor 102 detects the boost pressure Pm of the intake passage 22 downstream of the compressor 36 (202).

Detected engine speed Ne and boost pressure P
With reference to m and the map (see FIG. 2), the basic duty value setting means 124 sets the basic duty value D (204).

Next, the throttle opening degree Thr is detected by the throttle opening degree sensor 104 (206), and the correction coefficient setting means 128 sets the correction coefficient K from the table (see FIG. 3) based on the throttle opening degree Thr (see FIG. 3). 20
8).

The basic duty value correction means 130 corrects the basic duty value D by the correction coefficient K to obtain a corrected basic duty value D = D * K (210), and the control valve operation control means 126 corrects the basic duty value. Waste gate valve control valve 4 based on the duty value D = D * K
8 is operated to open / close the waste gate valve 44 so that the supercharging pressure Pm of the supercharger 34 becomes the target supercharging pressure Pt, and the end is set (212).

As described above, in the supercharging pressure control device 114 for the internal combustion engine 2, the control means 116 operates the waste gate valve control valve 48 based on the basic duty value D to operate the supercharging pressure Pm of the supercharger 34. When the waste gate valve 44 is controlled to be opened and closed so that the target boost pressure Pt becomes, the correction coefficient system K is set by the correction coefficient setting means 128 based on the throttle opening Thr detected by the throttle opening sensor 104. The duty value correcting means 130 corrects the basic duty value D by the correction coefficient K to obtain the corrected basic duty value D = D * K, and the waste gate valve control is performed based on the corrected basic duty value D = D * K. The valve 48 is operated to open / close the waste gate valve 44 so that the supercharging pressure Pm of the supercharger 34 becomes the target supercharging pressure Pt. It is your.

As a result, the boost pressure control device 114
As shown in FIG. 4, the basic duty value D is corrected to a small value so that the boost pressure Pm does not rise excessively when the throttle opening Thr is small and the throttle opening is low (when it is not necessary to raise the boost pressure so much). As a result, the discharge pressure Pcout immediately downstream of the compressor 36 can be prevented from rising too much, and the basic duty value D is corrected so that the change in the output characteristic becomes moderate with respect to the change in the throttle opening when the throttle opening is low or medium. can do.

Therefore, the supercharging pressure control device 114 is
The supercharger 34 does not perform extra work at the time of the low throttle opening, and it is possible to prevent the supercharging pressure from rising too much at the time of the low throttle opening, and it is possible to reduce the fuel consumption. The surging of the compressor 36 can be prevented, the output characteristic with respect to the change of the throttle opening can be made gentle and smooth, and the drivability can be improved. It is possible to reduce fuel consumption in the region, prevent surging of the compressor 36, and improve drivability.

Further, in the supercharging pressure control device 114, when the throttle valve 24 is opened to the set value S or more, the correction of the basic duty value D regulated by the correction coefficient K of the throttle opening Thr is released. As a result, the supercharging pressure Pm can be quickly increased, and the acceleration request can be satisfied.

The supercharging pressure control device 114 of this embodiment is used.
Has set the correction coefficient K based on the table of the throttle opening Thr, but it is corrected based on the two-dimensional map of the engine speed Ne detected by the crank angle sensor 100 and the throttle opening Thr detected by the throttle opening sensor 104. The coefficient K can also be set. In this case, the correction accuracy can be increased, and a finer boost pressure control can be realized.

Further, although the supercharging pressure control device 114 sets the correction coefficient K according to the throttle opening Thr, the correction coefficient K can be set based on the rate of change of the throttle opening Thr. In this case, the correction coefficient K can be set according to the change in the driving state, and the drivability can be improved.

Further, the supercharging pressure control device 114 can also set the correction coefficient K based on the throttle opening Thr and the intake air temperature. In this case, it is possible to suppress the fluctuation of the supercharging pressure with respect to the target supercharging pressure due to the change of the intake air temperature, and it is possible to improve the control accuracy of the supercharging pressure.

[0046]

As described above, the supercharging pressure control device for an internal combustion engine according to the present invention can correct the basic duty value so that the supercharging pressure does not rise too much when the throttle opening is small and the throttle opening is small. In addition, the basic duty value can be corrected so that the change of the output characteristic becomes gentle with respect to the change of the throttle opening when the throttle opening is low and medium.

Therefore, in this supercharging pressure control device, the supercharger does not perform extra work at the time of low throttle opening,
It is possible to prevent the boost pressure from rising excessively at low throttle opening, reduce fuel consumption, prevent compressor surging, and improve output characteristics against changes in throttle opening. Can be gentle and smooth,
The drivability can be improved.

[Brief description of drawings]

FIG. 1 is a flow chart of control of a supercharging pressure control device showing an embodiment of the present invention.

FIG. 2 is a diagram showing a map of basic duty values set by engine speed and supercharging pressure.

FIG. 3 is a diagram showing a table of correction coefficients according to throttle opening.

FIG. 4 is a diagram showing output characteristics according to pressure and throttle opening.

FIG. 5 is a schematic configuration diagram of a supercharging pressure control device for an internal combustion engine.

FIG. 6 is a flowchart of control of a supercharging pressure control device showing a conventional example.

FIG. 7 is a diagram showing a relationship between a supercharging pressure and a duty value.

[Explanation of symbols]

2 Internal combustion engine 10 Combustion chamber 22 Intake passage 24 Throttle valve 32 exhaust passage 34 Supercharger 36 Compressor 38 turbine 42 Exhaust bypass passage 44 waste gate valve 46 actuator 48 waste gate valve control valve 50 Supercharging pressure introduction passage 52 Supercharging pressure relief passage 100 crank angle sensor 102 pressure sensor 104 Throttle opening sensor 106 Water temperature sensor 108 Intake temperature sensor 110 knock sensor 114 Supercharging pressure controller 116 control means 124 Basic duty value setting means 126 Control valve operation control means 128 correction coefficient setting means 130 Basic duty value correction means

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Claims (2)

[Claims] 1. A compressor of a supercharger is provided in an intake passage of an internal combustion engine, and a turbine of a supercharger for driving the compressor is provided in an exhaust passage of the internal combustion engine, and the exhaust passage is communicated by bypassing the turbine. An exhaust bypass passage is provided,
A waste gate valve that opens and closes the exhaust bypass passage is provided, and an actuator that is operated by a supercharging pressure introduced from an intake passage downstream of the compressor to open and close the waste gate valve is provided. A waste gate valve control valve for adjusting the opening degree of the waste gate valve by releasing the supercharging pressure of the intake passage on the downstream side of the compressor introduced into the intake passage on the upstream side of the compressor is provided for the engine rotation of the internal combustion engine. An engine speed detecting means for detecting the engine speed is provided, a pressure detecting means for detecting the pressure in the intake passage on the downstream side of the compressor is provided, and the engine speed detected by the engine speed detecting means and the pressure detecting means are detected. Supercharging pressure in the intake passage downstream of the compressor A basic duty value setting means for setting a basic duty value is provided, and the waste gate valve control valve is operated based on the basic duty value set by the basic duty value setting means so that the supercharging pressure of the supercharger is the target supercharging value. In a supercharging pressure control device for an internal combustion engine, which is provided with control valve operation control means for controlling the opening and closing of the waste gate valve so that the pressure becomes a pressure, a throttle opening detection means for detecting a throttle opening of a throttle valve of the internal combustion engine is provided. A correction coefficient setting means for setting a correction coefficient based on the throttle opening detected by the throttle opening detection means is provided, and a basic duty value correction for correcting the basic duty value by the correction coefficient set by the correction coefficient setting means. A supercharging pressure control device for an internal combustion engine, characterized by comprising means. 2. The correction coefficient setting means sets the correction coefficient based on an engine speed detected by the engine speed detecting means and a throttle opening detected by the throttle opening detecting means. The supercharging pressure control device for an internal combustion engine according to claim 1.