JP2004332612A - Waist gate valve control device for internal combustion engine with supercharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waist gate valve control device for properly controlling a waist gate valve when a trouble occurs in a mechanism such as a knock sensor or an air bypass valve. <P>SOLUTION: An internal combustion engine with a supercharger has the supercharger 10 consisting of a turbine arranged in an exhaust passage and a compressor arranged in an intake passage, the waist gate valve 21 mounted in a bypass line 20 for bypassing the turbine of the supercharger in the exhaust passage, and a waist gate valve driving mechanism 23 for driving the waist gate valve 21. The waste gate valve control device for the internal combustion engine with the supercharger comprises the knock sensor 40 for detecting the vibration of the internal combustion engine, a knock CPU 41 for extracting a value equivalent to a vibration frequency from a detection signal for the knock sensor 40, and a control means 50 for controlling the waist gate valve driving mechanism 23 in accordance with a signal from the knock CPU 41. When determining that the knock sensor 40 or the knock CPU 41 is malfunctioned, the control means 50 controls the waist gate valve driving mechanism 23 so that the waist gate valve 21 is opened to restrict the supercharging pressure of the supercharger to preset pressure or lower. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a control device for a wastegate valve interposed in a bypass passage that bypasses a turbine of a supercharger in an internal combustion engine with a supercharger.
[0002]
[Prior art]
In an internal combustion engine with a supercharger, there has been proposed an example in which a supercharging pressure sensor is provided in an intake passage, and the opening degree of a wastegate is feedback-controlled based on a supercharging pressure measured by the supercharging pressure sensor (for example, see Patent Reference 1).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-345851
Patent Literature 1 discloses that when a supercharging pressure sensor is determined to be faulty, supercharging pressure control is performed by follow-up control that does not use a measured supercharging pressure.
[0005]
[Problems to be solved by the invention]
However, there is no disclosure of wastegate valve control when an abnormality occurs in a mechanism such as a knock sensor or an air bypass valve relating to supercharging pressure control in an internal combustion engine with a supercharger.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a wastegate valve control device that appropriately controls a wastegate valve when an abnormality occurs in a mechanism such as a knock sensor or an air bypass valve. Is to offer.
[0007]
Means for Solving the Problems and Functions and Effects
In order to achieve the above object, the invention according to claim 1 of the present invention bypasses a turbocharger including a turbine disposed in an exhaust passage and a compressor disposed in an intake passage, and a turbine of the supercharger in the exhaust passage. A knock sensor for detecting vibration of the internal combustion engine in an internal combustion engine with a supercharger including a wastegate valve interposed in a bypass passage and a wastegate valve driving mechanism for driving the wastegate valve; A knocking CPU for extracting a value corresponding to a vibration frequency from a detection signal of the sensor; and control means for controlling the wastegate valve driving mechanism based on a signal from the knocking CPU. If it is determined that the sensor or the knocking CPU is abnormal, the wastegate valve is opened and the turbocharger operates. It was wastegate valve controller for an internal combustion engine with a supercharger for controlling the waste gate valve drive mechanism to suppress the supercharging below a predetermined pressure.
[0008]
When an abnormality occurs in the knock sensor or the knocking CPU, the wastegate valve is opened to suppress the supercharging by the supercharger to a predetermined pressure or less. It is possible to suppress the occurrence of knocking due to rising, thereby protecting the internal combustion engine.
[0009]
According to a second aspect of the present invention, there is provided a supercharger including a turbine disposed in an exhaust passage and a compressor disposed in an intake passage, and a wastegate valve interposed in a bypass passage that bypasses the turbine of the supercharger in the exhaust passage. In a supercharged internal combustion engine having a wastegate valve driving mechanism for driving the wastegate valve, an air bypass valve mechanism provided in an air bypass passage that bypasses a compressor of the supercharger in an intake passage; And control means for controlling the wastegate valve mechanism. When the control means determines that the air bypass valve mechanism is abnormal, the control means opens the wastegate valve to reduce the supercharging by the supercharger to a predetermined pressure. The wastegate valve of an internal combustion engine with a supercharger that controls the wastegate valve drive mechanism to suppress A control device.
[0010]
When an abnormality occurs in the air bypass valve mechanism, the wastegate valve is opened and the supercharging by the supercharger is suppressed to a predetermined pressure or less. Therefore, it is not possible to reduce the supercharging pressure due to an abnormality in the air bypass valve mechanism. Thus, for example, it is possible to suppress the generation of a surge noise at the time of deceleration or the like, to prevent the intake system piping from coming off, and to prevent the boost pressure from overshooting.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment according to the present invention will be described below with reference to FIGS.
FIG. 1 is a schematic configuration diagram of an internal combustion engine with a supercharger and a wastegate valve control device according to the present embodiment.
[0012]
In the internal combustion engine 1, an intake passage 4 for intake and an exhaust passage 5 for exhaust extend from a combustion chamber in a cylinder 2 in which a piston 3 reciprocates, and a turbine 11 provided in the exhaust passage 5 The compressor 12 provided in the intake passage 4 is integrated with the turbocharger 10.
[0013]
An air cleaner 6 is provided at an end of the intake passage 4 upstream of the compressor 12, and an intercooler 7 and a throttle valve 8 are sequentially provided downstream of the compressor 12.
[0014]
An exhaust bypass passage 20 is provided in the exhaust passage 5 to bypass the turbine 11 of the supercharger 10 and communicate between the upstream side and the downstream side of the turbine 11. A waste gate valve 21 is interposed in the exhaust bypass passage 20, The gate valve 21 opens and closes the exhaust bypass passage 20.
[0015]
The waste gate valve 21 is opened and closed by the diaphragm actuator 24 in communication with the pressure chamber 24b of the diaphragm actuator 24.
The diaphragm chamber 24a of the diaphragm type actuator 24 communicates with the intake passage 4 upstream of the compressor 12 via the pressure guiding passage 25.
[0016]
A waste gate solenoid valve 26 is interposed in the middle of the pressure guiding passage 25, and the waste gate solenoid valve 26 is driven to open and close by a waste gate solenoid 27.
[0017]
In the pressure guiding passage 25, a branch passage 25a is branched downstream of the waste gate solenoid valve 26 and communicates with the intake passage 4 downstream of the compressor 12, and an orifice 28 is formed in the branch passage 25a.
[0018]
As described above, the wastegate valve driving mechanism 23 is configured by the diaphragm type actuator 24 and the wastegate solenoid 27 and the like.
[0019]
The waste gate valve driving mechanism 23 is configured such that the waste gate solenoid valve 26 opens the pressure guiding passage 25 by energizing the waste gate solenoid 27, and introduces the intake pressure into the diaphragm chamber 24a of the diaphragm type actuator 24, and increases the pressure in the pressure chamber 24b. The wastegate valve 21 closes the exhaust bypass passage 20.
[0020]
When the power supply to the waste gate solenoid 27 is cut off, the pressure in the diaphragm chamber 24a of the diaphragm type actuator 24 is released, and the pressure in the pressure chamber 24b is reduced, so that the waste gate valve 21 opens the exhaust bypass passage 20.
[0021]
The energization of the wastegate solenoid 27 is performed by a pulse drive signal whose duty ratio is controlled, and the opening of the wastegate by the wastegate valve 21 is controlled by the duty ratio. Supercharging is promoted by flowing toward the turbine 11.
[0022]
Accordingly, when the power supply to the wastegate solenoid 27 is turned off and the wastegate valve 21 opens the exhaust bypass passage 20, almost all of the exhaust gas flows through the exhaust bypass passage 20, and the supercharging pressure by the supercharger 10 becomes a small predetermined pressure. It can be suppressed below.
[0023]
The intake passage 4 is provided with an air bypass passage 30 that bypasses the compressor 12 and connects the downstream side of the intercooler 7 and the upstream side of the compressor 12, and a relief valve 32 is interposed in the air bypass passage 30. Have been.
[0024]
The relief valve 32 is a diaphragm-type valve. The inside of a valve body 32a is divided into a diaphragm chamber 32d and a communication chamber 32e by a diaphragm 32c to which a valve body 32b is attached, and the opening and closing of the air bypass passage 30 by movement of the valve body 32b. Is going.
The valve element 32b is urged in the closing direction by a spring 32f.
[0025]
When the pressure in the communication chamber 32e becomes higher than the pressure in the diaphragm chamber 32d by a predetermined pressure or more, the valve body 32b opens to communicate with the air bypass passage 30, and recirculates the supercharging pressure on the downstream side of the compressor 12 to the upstream side. To relieve.
[0026]
The diaphragm chamber 32d communicates with an output port 35c of an air bypass valve 35, which is a three-port solenoid valve. An input port 35b of the air bypass valve 35 communicates with the downstream side of the throttle valve 8, and another input port 35a. Communicates with the upstream side of the throttle valve 8.
[0027]
The air bypass valve mechanism 31 is configured as described above. When the input port 35b is closed and the input port 35a is opened in the demagnetized state of the air bypass solenoid 36, the intake negative pressure on the downstream side of the throttle valve 8 is output. It acts on the diaphragm chamber 32d of the relief valve 32 via the port 35c, so that the relief valve 32 can be opened.
[0028]
When the air bypass solenoid 36 is excited, the input port 35a is closed and the input port 35b is opened, so that the intake pressure on the upstream side of the throttle valve 8 acts on the diaphragm chamber 32d of the relief valve 32 via the output port 35c. With the same pressure as the communication chamber 32e, the relief valve 32 is kept closed by the urging force of the spring 32.
[0029]
Therefore, when the power supply to the air bypass solenoid 36 is turned off, the relief valve 32 is opened, and when the supercharging pressure of the supercharger 10 becomes higher than a predetermined pressure, the relief valve 32 is opened to open the air bypass passage. 30 communicates and the pressure is reduced.
[0030]
A knock sensor 40 for detecting vibration is attached to the cylinder 2 of the internal combustion engine 1, and a detection signal of the knock sensor 40 is extracted as a voltage corresponding to a vibration frequency by a knock CPU 41, and an ECU (electronic control unit) 50 is provided. Is input to
The ECU 50 determines whether knocking has occurred based on the input voltage.
[0031]
The ECU 50 also receives and processes signals from various sensors indicating the operating state of the internal combustion engine 1, such as the engine speed Ne, the throttle opening Th, the intake negative pressure Pb, the atmospheric pressure Pa, the intake temperature T, and the like. Various controls are performed, and the control of the wastegate solenoid 27 of the wastegate valve driving mechanism 23 and the control of the air bypass solenoid 36 of the air bypass valve mechanism 31 are also performed.
[0032]
In the internal combustion engine 1 with the supercharger described above, the ECU 50 determines whether the knock sensor 40 or the knock CPU 41 and the air bypass valve mechanism 31 are abnormal, and controls the wastegate valve driving mechanism 23 in accordance with the presence or absence of the abnormality. Hereinafter, description will be made based on the flowcharts of FIGS.
[0033]
First, the procedure for determining whether the knock sensor 40 is abnormal will be described with reference to the flowchart shown in FIG.
This flow is executed for each cycle of the internal combustion engine.
[0034]
It is determined whether or not the internal combustion engine 1 is being started (step 1). If the engine is being started, the process proceeds to step 2 and a normal state timer is initialized (a normal down timer is set and started). The abnormal state timer is initialized (the abnormal down timer is set and started), and in the next step 4, the existence information of the knock sensor signal is initialized (cleared).
[0035]
If it is determined in step 1 that the internal combustion engine 1 has been completely started, the process proceeds to step 5, where the presence or absence of a knock sensor signal is determined.
If there is a knock sensor signal, the process proceeds to step 6, where it is determined whether the normal state has elapsed for a predetermined time by the normal state timer. Until the normal state timer has elapsed, the failure state timer and the knock sensor signal presence information are initialized in steps 3 and 4 each time. I do.
[0036]
When the normal state has passed for a predetermined time, the process proceeds from step 6 to step 7 to determine the normal state, set the abnormal flag Fa to "0", and execute steps 3 and 4.
Therefore, if there is a knock sensor signal at every cycle, knock sensor 40 is determined to be normal, and abnormal flag Fa is "0".
[0037]
However, if there is no knock sensor signal, the process proceeds from step 5 to step 8 to initialize a normal state timer and determine whether or not the temperature is lower than a predetermined water temperature (step 9) or lower than a predetermined engine speed (step 10). If it is lower than the water temperature or lower than the predetermined engine speed, the process proceeds to steps 3 and 4 and no abnormality determination is performed.
[0038]
If it exceeds the predetermined water temperature and the predetermined engine speed, the process proceeds to step 11, the abnormal state timer determines whether the abnormal state has elapsed for a predetermined time, and exits this routine until the predetermined time elapses. Proceeding to step 12, it is determined that an abnormality has occurred, and the abnormality flag Fa is set to "1".
[0039]
As described above, the abnormality of the knock sensor 40 is determined based on the presence or absence of the knock sensor signal. When the knock sensor 40 is normal, the abnormality flag Fa = 0, but when an abnormality occurs, the abnormality flag Fa is set to “1”.
[0040]
Next, a procedure for determining an abnormality of knocking CPU 41 based on the presence or absence of a signal from knocking CPU 41 will be described with reference to the flowchart of FIG.
First, it is determined whether or not there is a signal from the knocking CPU 41 (step 21). If the signal is present, the process proceeds to step 22 to indicate that the signal is normal, the abnormal flag Fb = 0, and the abnormal state timer is initialized (step 23).
[0041]
If it is determined in step 21 that there is no signal from the knocking CPU 41, the process proceeds to step 24 to determine whether or not the abnormal state has elapsed for a predetermined time by the abnormal state timer. After elapse, the process proceeds to step 25, where it is determined that an abnormality has occurred, and “1” is set in the abnormality flag Fb.
[0042]
Further, a procedure for determining a communication abnormality of the knocking CPU 41 will be described with reference to the flowchart of FIG.
First engine speed Ne, it is determined whether or not a predetermined rotational speed _{N 1} (e.g., 400 rpm) or less (step 31), and clears the count value K of the abnormality counter jumps to step 32 if _{N 1} or less, then the abnormality flag Fc = 0 (step 32).
[0043]
When the engine speed Ne exceeds a predetermined rotational speed _{N 1,} the process proceeds turn the engine rotational speed Ne step 34 it is determined whether a predetermined rotational speed _{N 2} (e.g., 1200 rpm) or more from the step 31, if N2 or more steps the process proceeds to step 36 to allow the implementation of communication abnormality determination of knocking CPU41 proceeds to 35, the process proceeds without permission step 36 exemplary communication abnormality determined to be less than N _2.
[0044]
In step 36, it is determined whether or not a predetermined time has elapsed since the engine was started. If not, the process proceeds to step 37 to determine whether or not the execution of the communication abnormality determination is permitted first. If the predetermined time has not elapsed after the start and there is no permission to execute the communication abnormality determination, the process jumps to step 32 and the communication abnormality determination is not performed.
[0045]
Even if the predetermined time has not elapsed after the start of the engine, if the execution of the communication abnormality determination is permitted first, the process proceeds to step 38.
If it is determined in step 36 that the predetermined time has elapsed after the start of the engine, the flow jumps directly to step 38.
[0046]
When it is determined that the communication abnormality of the knocking CPU 41 can be reliably determined as described above, the process proceeds to step 38, where it is determined whether or not data has been normally received from the knocking CPU 41. Proceeding to step 39, a predetermined number of times a is subtracted from the count value K of the abnormality counter. If the count value K becomes a negative value (step 40), the count value K is set to 0 (step 41) and step 43. If the count value K ≧ 0 (step 40), the process jumps directly to step 43.
[0047]
If data cannot be normally received from the knocking CPU 41 in step 38, the process jumps to step 42, adds a predetermined number b (<a) to the count value K of the abnormality counter, and proceeds to step 43.
[0048]
Therefore, the count value K of the abnormal counter increases when the proportion of data that cannot be normally received is large to some extent, and it is determined in step 43 whether or not this count value K is equal to or greater than a predetermined value k. When it becomes k or more, the process proceeds to step 44, where it is determined that the communication of the knocking CPU 41 is abnormal, and the abnormality flag Fc is set to "1".
[0049]
When the knock sensor 40 or the knocking CPU 41 has an abnormality as described above, “1” is set in any of the abnormality flags Fa, Fb, and Fc.
[0050]
Next, a procedure for determining an abnormality of the air bypass valve mechanism 31 that controls the opening and closing of the air bypass passage 30 provided in the intake passage 4 will be described with reference to the flowchart of FIG.
[0051]
First, it is determined whether or not the IG1 voltage applied to the air bypass solenoid 36 that opens and closes the air bypass valve 35 is equal to or lower than a predetermined voltage (step 51). If not, the abnormality determination of the air bypass valve mechanism 31 is not performed. Proceeding to step 52, the normal OFF state is determined (OFF abnormal flag Foff = 0), the abnormal OFF timer is initialized (step 53), the abnormal ON timer is initialized (step 54), and the normal ON state is determined in step 55. (ON abnormality flag Fon = 0).
[0052]
When it is determined in step 51 that the IG1 voltage exceeds the predetermined voltage, the air bypass valve mechanism 31 is determined to be abnormal, and the routine jumps to step 60.
In step 60, it is determined whether or not the air bypass valve (ABV) signal is an ON command, that is, whether an energizing command is issued to the air bypass solenoid 36, and whether the ON command is absent or not is determined. Determine the abnormality.
[0053]
If there is no ON command, the routine proceeds to step 61, in which an abnormality of the air bypass valve mechanism 31 is determined. If there is an ON instruction, the routine proceeds to step 71, in which the abnormality of the air bypass valve mechanism 31 is determined.
In each case, the abnormality is determined by the same procedure.
[0054]
The case where the process proceeds to step 61 without the ABV signal ON command will be described below according to steps 61 to 69.
In step 61, the ON abnormal state timer is initialized, and the ON normal state timer is initialized (step 62). In step 63, the ABV signal is detected (returned) to determine whether the signal is an OFF signal.
[0055]
If it is an OFF signal, it is normal, and the process proceeds to step 64 to initialize the OFF abnormal state timer, and in step 65, it is determined whether or not the OFF normal state has passed a predetermined time by the OFF normal state timer, and the predetermined time has elapsed. At this time, the routine proceeds to step 66, where the OFF normal state is determined, and the OFF abnormality flag Foff = 0 is set.
[0056]
If the result of the detection (return) of the ABV signal in step 63 is not the OFF signal, it is not the normal state, and the process proceeds to step 67, where it is determined whether or not the OFF abnormal state has passed for a predetermined time by the OFF abnormal state timer. When the time has elapsed, the routine proceeds to step 68, where the OFF abnormal state is determined, and the OFF abnormal flag Foff is set to "1".
Then, the OFF normal state timer is initialized (step 69).
[0057]
The above is the abnormality determination procedure when there is no ABV signal ON command. When there is an ABV signal ON instruction, the process jumps from step 60 to step 71 and performs abnormality determination in substantially the same procedure.
[0058]
That is, the OFF abnormal state timer is initialized (step 71), the OFF normal state timer is initialized (step 72), and the ABV signal is detected (returned) to determine whether the signal is an ON signal (step 63).
[0059]
If it is an ON signal, it is normal, and the process proceeds to step 74 to initialize the ON abnormal state timer, and determines whether or not the ON normal state has passed a predetermined time by the ON normal state timer (step 75), and the predetermined time has elapsed. Then, the process proceeds to step 76 to determine the ON normal state, and sets the ON abnormality flag Fon = 0.
[0060]
If the result of the detection (return) of the ABV signal in step 73 is not an ON signal, it is not a normal state, and the process proceeds to step 77, where it is determined whether or not the ON abnormal state has passed for a predetermined time by an ON abnormal state timer. When the time has elapsed, the routine proceeds to step 78, where the OFF abnormal state is determined, the OFF abnormal flag Fon is set to "1", and the ON normal state timer is initialized (step 79).
[0061]
In this way, the ABV signal abnormality is determined for each of the case where there is no ON command of the ABV signal and the case where the ON command is not present. If there is an abnormality when there is no ON command, the OFF abnormality flag Foff is set to “1”, and the ON command is issued. If there is an abnormality, the ON abnormality flag Fon is set to "1".
[0062]
As described above, each abnormality of the knock sensor 40, the knocking CPU 41, and the air bypass valve mechanism 31 is determined, and the waste gate valve driving mechanism 23 is determined based on the determined abnormality flags Fa, Fb, Fc, Foff, and Fon. Control is exercised.
[0063]
A control procedure of the wastegate valve driving mechanism 23 will be described with reference to a flowchart shown in FIG.
First, in step 81, data of the throttle opening Th indicating the operating state of the internal combustion engine 1, the engine speed Ne, the intake air temperature T, the atmospheric pressure Pa, etc., and the abnormal flags Fa, Fb, Fc, Foff and Fon are input.
[0064]
From the next step 82 to step 86, it is determined whether or not each abnormal flag Fa, Fb, Fc, Foff, Fon is set to “1”, and “1” is set to any abnormal flag. If it is determined that they are all normal, the process proceeds to step 87.
[0065]
In step 87, the basic supercharging pressure Po is calculated from the throttle opening Th and the engine speed Ne. In the next step 88, the basic supercharging pressure Po is corrected based on the intake air temperature T and the atmospheric pressure Pa, and the final supercharging pressure Po is calculated. Calculate Pf.
[0066]
Then, the waste gate solenoid 27 is duty-controlled by the calculated final supercharging pressure Pf (step 89).
That is, when all of knock sensor 40, knock CPU 41, and air bypass valve mechanism 31 are normal, the opening of wastegate valve 21 is controlled based on final supercharging pressure Pf.
[0067]
If any of knock sensor 40, knock CPU 41, and air bypass valve mechanism 31 has an abnormality and at least one of abnormality flags Fa, Fb, Fc, Foff, and Fon is "1", the routine jumps to step 90. Then, the power supply to the wastegate solenoid 27 is turned off.
[0068]
When the power supply to the wastegate solenoid 27 is turned off, the wastegate solenoid valve 26 closes, a negative pressure acts on the diaphragm actuator 24a to open the wastegate valve 21, and the exhaust gas almost flows into the exhaust bypass passage 20 and passes. The supercharging pressure by the feeder 10 is controlled to a small predetermined pressure or less.
[0069]
Therefore, when an abnormality occurs in knock sensor 40 or knock CPU 41, occurrence of knocking due to an increase in boost pressure can be suppressed, and protection of internal combustion engine 1 can be achieved.
[0070]
Further, even when an abnormality occurs in the air bypass valve mechanism 31, the supercharging pressure is controlled to a small predetermined pressure or less, thereby suppressing generation of a surge noise at the time of deceleration or the like, and reducing the intake system piping. It is possible to prevent the disconnection and the overshoot of the supercharging pressure.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an internal combustion engine with a supercharger and a wastegate valve control device according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a procedure for determining an abnormality of a knock sensor.
FIG. 3 is a flowchart illustrating a procedure for determining an abnormality of a knocking CPU.
FIG. 4 is a flowchart illustrating a procedure for determining a communication abnormality of a knocking CPU.
FIG. 5 is a flowchart showing a procedure for determining an abnormality of an air bypass valve mechanism.
FIG. 6 is a flowchart showing a control procedure of a wastegate valve driving mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Cylinder, 3 ... Piston, 4 ... Intake passage, 5 ... Exhaust passage, 6 ... Air cleaner, 7 ... Intercooler, 8 ... Throttle valve,
10: supercharger, 11: turbine, 12: compressor,
20 ... exhaust bypass passage, 21 ... waste gate valve, 23 ... waste gate valve driving mechanism, 24 ... diaphragm type actuator, 25 ... pressure guide passage, 26 ... waste gate solenoid valve, 27 ... waste gate solenoid, 28 ... orifice,
30 ... air bypass passage, 31 ... air bypass valve mechanism, 32 ... relief valve, 35 ... air bypass valve, 36 ... air bypass solenoid,
40: knock sensor, 41: knock CPU,
50 ... ECU.

Claims (2)

A supercharger including a turbine disposed in an exhaust passage and a compressor disposed in an intake passage, a wastegate valve interposed in a bypass passage bypassing the turbine of the supercharger in the exhaust passage, and the wastegate valve. In the internal combustion engine with a supercharger equipped with a wastegate valve drive mechanism to drive,
A knock sensor for detecting vibration of the internal combustion engine,
A knocking CPU that extracts a value corresponding to a vibration frequency from a detection signal of the knock sensor;
Control means for controlling the wastegate valve driving mechanism based on a signal from the knocking CPU,
When the control means determines that the knock sensor or the knock CPU is abnormal, the control means controls the wastegate valve driving mechanism so as to open the wastegate valve and suppress the supercharging by the supercharger to a predetermined pressure or less. A wastegate valve control device for an internal combustion engine with a supercharger, comprising: A supercharger comprising a turbine disposed in an exhaust passage and a compressor disposed in an intake passage, a wastegate valve interposed in a bypass passage bypassing the turbine of the supercharger in the exhaust passage, and driving the wastegate valve In a supercharged internal combustion engine equipped with a wastegate valve drive mechanism to
An air bypass valve mechanism provided in an air bypass passage that bypasses the compressor of the supercharger in the intake passage;
Control means for controlling the wastegate valve mechanism,
When the control means determines that the air bypass valve mechanism is abnormal, the control means controls the wastegate valve driving mechanism so as to open the wastegate valve and suppress supercharging by the supercharger to a predetermined pressure or less. A wastegate valve control device for an internal combustion engine with a supercharger.

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