JP2019178653A - Control device and control method - Google Patents

Abstract

To control a waste gate valve of a supercharger so as to shorten time until target surge tank pressure is obtained.SOLUTION: A supercharger includes: a turbine 56 rotated by exhaust gas of an engine 2; a compressor 50 rotated in accordance with the rotation of the turbine and compressing intake air of the engine; a throttle 52 for controlling a flow rate of the intake air compressed by the compressor; a surge tank 54 for homogenizing the intake air controlled by the throttle; and a waste gate valve 58 for opening/closing a bypass exhaust passage 57 for discharging exhaust gas of the engine without the turbine interposed at any opening between full opening and full closing. The control device 7 is configured to include an opening control section 734 for controlling the waste gate valve so that an opening of the bypass exhaust passage becomes an opening that is not full opening in a supercharging state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a waste gate valve control device and control method for controlling the opening degree of a bypass exhaust path in a supercharger used in a gasoline engine or a diesel engine.

  A supercharger used for a gasoline engine or a diesel engine has a turbine that is rotated by exhaust of the engine. And a supercharger raises the pressure of the intake air supplied to an engine by the compressor connected with the turbine. The intake air whose pressure has increased is adjusted in flow rate by a throttle, and is homogenized in a surge tank, and then supplied to the engine.

  Part of the engine exhaust is discharged from the bypass exhaust path after the flow rate is adjusted by a waste gate valve (also referred to as “WGV” in this specification and drawings), and the rest is discharged after driving the turbine. .

  The output of the engine having the supercharger is controlled by a control device that adjusts the opening degree of the throttle and the waste gate valve.

  FIG. 6 is a diagram illustrating engine output control based on the opening of the throttle and the waste gate valve.

  In the graph 90 shown in FIG. 6, the accelerator opening (%) is shown on the horizontal axis, and the surge tank pressure (kPa) corresponding to the accelerator opening is shown on the vertical axis in the region 90a. The throttle opening (%) for obtaining the surge tank pressure corresponding to the accelerator opening is indicated by the vertical axis of the region 90b, and the waste gate valve opening (%) is indicated by the vertical axis of the region 90c. In the example of FIG. 6, the opening of the bypass exhaust path is fully opened by fully opening the waste gate valve opening, and the opening of the bypass exhaust path is fully closed by fully closing the waste gate valve opening. .

The surge tank pressure corresponding to the accelerator opening A ₀ is P ₀ , that is, atmospheric pressure. When the accelerator opening is A ₀ , the control device controls the throttle and the waste gate valve so that the throttle opening is T ₀ that is fully open and the waste gate valve opening is W ₀ that is fully open.

The surge tank pressure corresponding to A ₁ whose accelerator opening is smaller than A ₀ is P ₁ smaller than atmospheric pressure. At this time, the engine is in a non-supercharged state. When the accelerator opening is A ₁ , the control device controls the throttle and the waste gate valve so that the throttle opening becomes T ₁ which is closed rather than fully opened, and the waste gate valve opening becomes W ₀ which is fully opened.

The surge tank pressure corresponding to A ₂ having an accelerator opening larger than A ₀ is P ₂ larger than the atmospheric pressure. At this time, the engine is supercharged. When the accelerator opening is A ₂ , the control device controls the throttle and the waste gate valve so that the throttle opening becomes T _{0 which} is fully opened and the waste gate valve opening becomes W ₂ which is closed rather than fully opened.

  Thus, in the negative pressure region where the surge tank pressure is smaller than the atmospheric pressure (that is, in the non-supercharged state), the control device determines the supercharging region where the surge tank pressure is larger than the atmospheric pressure (that is, the supercharging). In the state), the engine output is adjusted by the waste gate valve opening.

  In Patent Document 1, the waste gate valve is operated in the closing direction when moving from the negative pressure region to the supercharging region, and the waste gate valve is operated in the opening direction when moving from the supercharging region to the negative pressure region. An electronic control device is described.

JP 2013-170527 A

When the accelerator opening is changed from A ₁ to A ₂ , the control device shifts the throttle opening from T ₁ to T ₀ to shift the surge tank pressure from P _{1 in the} negative pressure region to P ₂ in the supercharging region. Then, the waste gate valve opening is changed from W ₀ to W ₂ .

A predetermined time is required until the waste gate valve opening is changed from W ₀ to W ₂ . During this time, since the waste gate valve opening is larger than the desired opening W ₂ , part of the exhaust that should originally drive the turbine is discharged without being used to drive the turbine, and the surge tank pressure is P _2. It takes time to rise.

  An object of the present invention is to provide a control device and a control method for a wastegate valve of a supercharger that can shorten the time required to obtain a target surge tank pressure.

  A control device according to the present invention includes a turbine that rotates by exhaust of an engine, a compressor that rotates in accordance with the rotation of the turbine and compresses intake air of the engine, a throttle that adjusts the flow rate of intake air compressed by the compressor, and a throttle A surge tank that homogenizes the adjusted intake air, and a waste gate valve that opens and closes a bypass exhaust path that exhausts engine exhaust without going through the turbine at any opening between fully open and fully closed A control device that controls the opening degree of a waste gate valve in a supercharger that controls the waste gate valve so that the opening degree of the bypass exhaust path is not fully opened in a non-supercharging state. An opening degree control unit is provided.

  The control device according to the present invention further includes a rotation speed acquisition unit that acquires the rotation speed of the engine and a target pressure determination unit that determines a target surge tank pressure that is a target surge tank pressure. The degree control unit controls the waste gate valve so that the opening degree of the bypass exhaust path is determined based on the engine speed and the target surge tank pressure in the non-supercharging state. Is preferred.

  Further, in the control device according to the present invention, the opening degree control unit controls the waste gate valve so that the opening degree of the bypass exhaust path increases as the engine speed increases and the target surge tank pressure increases. It is preferable to control.

  Further, the control device according to the present invention further includes a supercharging pressure acquisition unit that acquires a supercharging pressure that is a pressure between the compressor and the throttle, and the opening degree control unit is in a non-supercharging state, and When the supply pressure exceeds the upper limit value, it is preferable to control the waste gate valve so that the opening degree of the bypass exhaust path is increased by a predetermined value.

  In the control device according to the present invention, the opening degree control unit controls the waste gate valve so as to control the current for driving the electric actuator and to change the opening degree of the waste gate valve according to the rotation amount of the electric actuator. Is preferred.

  Furthermore, a control method according to the present invention includes a turbine that is rotated by exhaust of an engine, a compressor that rotates in accordance with the rotation of the turbine and compresses intake air of the engine, a throttle that adjusts a flow rate of intake air compressed by the compressor, A surge tank that homogenizes the intake air adjusted by the throttle, and a waste gate that opens and closes the bypass exhaust path for exhausting the engine exhaust without going through the turbine at any opening between fully open and fully closed A wastegate control method for controlling a degree of opening of a waste gate valve in a supercharger having a valve so that the degree of opening of the bypass exhaust path is not fully open when in a non-supercharging state. An opening degree controlling step for controlling the valve.

  According to said control apparatus, the wastegate valve of a supercharger can be controlled so that the time until it obtains a target surge tank pressure can be shortened.

  Moreover, according to said control method, the wastegate valve of a supercharger can be controlled so that time until it obtains a target surge tank pressure can be shortened.

It is a hardware schematic diagram of the power plant containing the control device concerning an embodiment. It is a figure which shows the hardware constitutions of the control apparatus concerning embodiment. It is a figure which shows the functional block of the control apparatus concerning embodiment. It is a graph which shows the relationship between the target surge tank pressure in a non-supercharging state, and the waste gate valve operation amount. It is a flowchart of the surge tank pressure change process in the control device according to the embodiment. It is a figure explaining control of the opening of a throttle and a waste gate valve based on an accelerator opening.

  Hereinafter, a control device and a control method will be described in detail with reference to the drawings. However, it should be understood that the present invention is not limited to the drawings or the embodiments described below.

  The control device and the control method according to the present invention control the wastegate valve so that the opening degree of the bypass exhaust path is not fully opened in the non-supercharging state in the engine supercharging mechanism. Reduce the time to reach the target surge tank pressure.

  FIG. 1 is a hardware schematic diagram of a power plant including a control device according to an embodiment.

  The power unit 1 includes an engine 2, an intake path 3, an exhaust path 4, a supercharging mechanism 5, an accelerator 6, and a control device 7. The power unit 1 is mounted on a vehicle and supplies power to driving wheels of the vehicle.

  The engine 2 is a gasoline engine that outputs a pressure generated by burning gasoline supplied together with air as kinetic energy. The engine 2 is supplied with air as intake air from the intake passage 3, and exhausts exhaust gas generated by combustion to the exhaust passage 4. The engine 2 may be a diesel engine.

  The intake path 3 is a path through which intake air from the engine 2 passes. The intake path 3 is connected to the engine 2 via the supercharging mechanism 5.

  The exhaust path 4 is a path through which exhaust from the engine 2 passes. The exhaust path 4 is connected to the engine 2 via the supercharging mechanism 5.

  The supercharging mechanism 5 is a mechanism that compresses the intake air of the engine 2 by the flow of exhaust from the engine 2. The supercharging mechanism 5 includes a compressor 50, a supercharging pressure sensor 51, a throttle 52, an electric actuator 53 for throttle, a surge tank 54, a surge tank pressure sensor 55, a turbine 56, a bypass exhaust path 57, It has a wastegate valve 58 and a wastegate valve electric actuator 59.

  The compressor 50 is an impeller in which blades are formed around a rotating body that rotates around a rotation shaft and is disposed at a position where intake air toward the engine 2 passes in the intake passage 3. The compressor 50 compresses the intake air toward the engine 2 by rotating.

  The supercharging pressure sensor 51 is a sensor that detects a supercharging pressure that is the pressure of the intake air of the engine 2 compressed by the compressor 50. The supercharging pressure sensor 51 is disposed in the intake path 3 between the compressor 50 and the throttle 52.

  The throttle 52 is a valve that adjusts the flow rate of the intake air of the engine 2. The throttle 52 adjusts the flow rate of intake air supplied to the engine 2 and, as a result, varies the output of the engine 2. The throttle 52 is disposed in the intake path 3 between the compressor 50 and the engine 2.

  The throttle electric actuator 53 is an actuator driven by electric power. The throttle electric actuator 53 has a rod that operates by the supplied electric power, and varies the opening degree of the throttle 52 connected to the rod.

  The surge tank 54 is a space provided in the intake path 3 between the throttle 52 and the engine 2, and intake air whose flow rate is adjusted by the throttle 52 flows in. The surge tank 54 temporarily holds the intake air that has flowed in to supply the homogenized intake air to the engine 2.

  The surge tank pressure sensor 55 is a sensor that detects a surge tank pressure that is a pressure in the surge tank 54.

  The turbine 56 is an impeller in which blades are formed around a rotating body that rotates around a rotation shaft and is disposed at a position where the exhaust of the engine 2 passes in the exhaust path 4, and rotates by the exhaust of the engine 2. . The turbine 56 is connected to the compressor 50, and the compressor 50 rotates according to the rotation of the turbine 56.

  The bypass exhaust path 57 is a path for discharging the exhaust of the engine 2 to the exhaust path 4 without passing through the turbine 56. The bypass exhaust path 57 connects the upstream and downstream of the turbine 56 in the exhaust path 4.

  The waste gate valve 58 is a valve that adjusts the flow rate of the exhaust gas of the engine 2 via the bypass exhaust path 57. The waste gate valve 58 is provided in the bypass exhaust path 57, and opens and closes the bypass exhaust path 57 at any opening degree between fully open and fully closed. The waste gate valve 58 adjusts the flow rate of the exhaust gas of the engine 2 passing through the turbine 56, and as a result, the output of the engine 2 is changed.

  The waste gate valve 58 only needs to be able to adjust the opening degree of the bypass exhaust passage 57. In the present embodiment, the bypass exhaust passage 57 is configured to be fully open when the waste gate valve 58 is fully open.

  Conversely, the bypass exhaust path 57 may be fully closed when the waste gate valve 58 is fully open. For example, the waste gate valve 58 may be provided on the path side that passes through the turbine 56, and may be configured to adjust the flow rate of the exhaust gas of the engine 2 that passes through the turbine 56. In this case, when the waste gate valve 58 is fully opened, the exhaust through the bypass exhaust path 57 is minimized.

  The waste gate valve electric actuator 59 is an actuator driven by electric power. The waste gate valve electric actuator 59 has a rod that operates by the supplied electric power, and the opening degree of the waste gate valve 58 connected to the rod can be changed to a desired opening degree by the amount of movement of the rod. .

  The waste gate valve electric actuator 59 may operate the rod so that the opening degree of the waste gate valve 58 biased in the fully-closed direction increases, and the waste gate valve 58 biased in the fully-open direction opens. The rod may be operated to reduce the degree.

  The accelerator 6 is an input device that receives an operation for adjusting the output of the engine 2 by the operator. The accelerator 6 includes an accelerator pedal 60 and an accelerator opening sensor 61.

  The accelerator pedal 60 is a pedal that is disposed near the floor in front of the driver's seat and is stepped on by the driver's feet. The accelerator opening sensor 61 is a sensor that detects an accelerator opening that is an amount of depression of the accelerator pedal 60.

  The control device 7 supplies driving power to the throttle electric actuator 53 and the waste gate valve electric actuator 59. The control device 7 receives inputs from the waste gate valve 58 engine 2, the supercharging pressure sensor 51, the surge tank pressure sensor 55, and the accelerator 6.

  FIG. 2 is a diagram illustrating a hardware configuration of the control device according to the embodiment.

  The control device 7 includes an input unit 71, an output unit 72, and a calculation unit 73. The control device 7 is mounted on the vehicle as an ECU (Electronic Control Unit).

  The input unit 71 is a circuit that receives signals from each unit of the power plant 1. The input unit 71 receives the rotation speed of the engine 2 from the rotation speed sensor attached to the engine 2, receives the boost pressure from the boost pressure sensor 51, receives the surge tank pressure from the surge tank pressure sensor 55, The accelerator opening is received from the accelerator 6. The input unit 71 supplies the received signal to the calculation unit 73.

  The output unit 72 is a circuit that supplies power for operating each unit of the power plant 1. The output unit 72 supplies electric power to the throttle electric actuator 53 and supplies electric power to the waste gate valve electric actuator 59 based on the control signal received from the calculation unit 73.

  The computing unit 73 performs computation based on the signal supplied from the input unit 71 and outputs a control signal to the output unit 72. The calculation unit 73 executes a calculation by executing a predetermined program. The calculation unit 73 may be realized by a dedicated circuit.

  FIG. 3 is a diagram illustrating functional blocks of the control device according to the embodiment.

  The control device 7 includes a target pressure determination unit 731, a rotation speed acquisition unit 732, a supercharging pressure acquisition unit 733, and an opening degree control unit 734 as functional blocks. Each functional block can be realized by executing a predetermined program by the calculation unit 73. Each functional block may be realized by a dedicated circuit.

  The target pressure determination unit 731 determines a target surge tank pressure that is a target pressure of the surge tank 54.

  The rotational speed acquisition unit 732 acquires the rotational speed of the engine 2.

  The supercharging pressure acquisition unit 733 acquires a supercharging pressure that is a pressure between the compressor 50 and the throttle 52.

  The opening degree control unit 734 controls the opening degree of the bypass exhaust path 57 to be an opening degree that is not fully open when the supercharging condition is not satisfied and the state is the non-supercharging state. That is, the opening degree control unit 734 determines the opening degree of the target bypass exhaust path 57 as an opening degree that is not fully open, and controls the waste gate valve 58 so that the determined opening degree is obtained. The opening degree control unit 734 acquires atmospheric pressure from an atmospheric pressure sensor (not shown) that detects atmospheric pressure.

  The opening degree control unit 734 outputs a control signal corresponding to the opening degree of the waste gate valve 58 by calculation, and an output unit 72 that supplies electric power to the waste gate valve electric actuator 59 based on the control signal. It is realized by.

  The opening degree control unit 734 determines the opening degree of the bypass exhaust path 57 based on the rotational speed of the engine 2 and the target surge tank pressure. Thereby, the opening degree control unit 734 can control the waste gate valve 58 so that the opening degree of the bypass exhaust path 57 becomes an appropriate opening degree according to the rotation speed of the engine 2 and the target surge tank pressure. .

  Here, the appropriate opening degree of the bypass exhaust passage 57 according to the rotational speed of the engine 2 and the target surge tank pressure does not deteriorate the exhaust pressure (primary exhaust pressure) between the engine 2 and the turbine 56 ( The opening is such that fuel consumption does not deteriorate. The opening degree of the bypass exhaust passage 57 is preferably as close to the closed side as possible in a range where the primary exhaust pressure does not deteriorate.

  FIG. 4 is a graph showing the relationship between the target surge tank pressure and the waste gate valve operation amount in the non-supercharged state.

  In the graph 80 shown in FIG. 4, the horizontal axis represents the target surge tank pressure (kPa), and the vertical axis represents the waste gate valve operation amount (%). The waste gate valve operation amount is an operation amount for moving the waste gate valve in the fully closed position in the opening direction.

  In the example of FIG. 4, the wastegate valve electric actuator 59 operates the wastegate valve 58 biased in the fully closed direction in the opening direction. Therefore, in the example of FIG. 4, the waste gate valve 58 and the bypass exhaust path 57 become closer to the fully open state as the operation amount of the waste gate valve is larger.

  The relationship between the target surge tank pressure and the amount of operation of the waste gate valve in the non-supercharged state is defined separately when the engine 2 has a high rotation speed, a middle rotation speed, and a low rotation speed. A series 801 shows the relationship between the target surge tank pressure and the waste gate valve operation amount when the rotation speed of the engine 2 is high (for example, 5000 rpm or more). A series 802 shows the relationship between the target surge tank pressure and the waste gate valve operation amount when the rotation speed of the engine 2 is medium (for example, not less than 2000 rpm and less than 5000 rpm). A series 803 shows the relationship between the target surge tank pressure and the waste gate valve operation amount when the rotation speed of the engine 2 is low (for example, less than 2000 rpm).

  When the target surge tank pressure is the same, the opening degree control unit 734 increases the operation amount of the waste gate valve 58 as the rotational speed of the engine 2 increases, that is, opens the waste gate valve 58 and the bypass exhaust path 57. Control to increase the degree. When the engine 2 has the same rotation speed, the opening degree control unit 734 increases the operation amount of the waste gate valve 58 as the target surge tank pressure increases, that is, the waste gate valve 58 and the bypass exhaust path 57. The opening is controlled so as to increase.

  In each case, the operation amount of the waste gate valve 58 is controlled so that the opening degree of the bypass exhaust passage 57 is close to the closed side in a range where the fuel consumption does not deteriorate. By controlling in this way, the opening degree control part 734 is a waste gate valve so that the opening degree of the bypass exhaust path 57 becomes a more appropriate opening degree according to the rotation speed of the engine 2 and the target surge tank pressure. 58 can be controlled.

  In addition, when the supercharging pressure acquired by the supercharging pressure acquisition unit 733 exceeds the upper limit value in the non-supercharging state, the opening degree control unit 734 causes the waste gate to increase the opening degree of the bypass exhaust passage 57 by a predetermined value. The valve 58 may be controlled. The upper limit value is, for example, a value of atmospheric pressure. When the supercharging pressure increases, the energy required for the engine 2 to exhaust the exhaust increases, and the fuel efficiency deteriorates. If the opening degree control part 734 controls as mentioned above, the excessive raise of a supercharging pressure will be suppressed and the deterioration of a fuel consumption will be prevented.

  FIG. 5 is a flowchart of surge tank pressure change processing in the control device according to the embodiment.

  First, the target pressure determination unit 731 determines a target surge tank pressure (step S1).

  Next, the rotation speed acquisition unit 732 acquires the rotation speed of the engine 2 (step S2).

  Next, the opening degree control unit 734 determines a target opening degree of the bypass exhaust path 57 (step S3). When the target surge tank pressure determined in step S1 is smaller than the atmospheric pressure, the opening degree control unit 734 determines that the engine 2 is in a non-supercharged state, and opens the opening degree of the bypass exhaust path 57 that is not fully opened. Decide every degree.

  Next, the opening degree control unit 734 calculates the amount of current necessary to drive the waste gate valve electric actuator 59 so that the opening degree of the bypass exhaust path 57 becomes the opening degree determined in step S3 ( Step S4).

  Next, the opening degree control unit 734 drives the waste gate valve electric actuator 59 with the calculated current amount (step S5). At this time, the opening degree control unit 734 may perform PWM (Pulse Width Modulation) control to drive the waste gate valve electric actuator 59 with a duty ratio corresponding to the calculated current amount.

  Next, the supercharging pressure acquisition part 733 acquires a supercharging pressure (step S6). Then, the opening degree control unit 734 determines whether or not the boost pressure acquired in step S6 exceeds the upper limit value (step S7).

  When the supercharging pressure exceeds the upper limit value (step S7: Y), the opening degree control unit 734 moves the determined wastegate valve electric actuator 59 so that the opening degree of the bypass exhaust path 57 is increased by a predetermined value. A correction amount of the driving current is calculated (step S8). Thereafter, the process of the control device 7 returns to step S5.

  When the supercharging pressure does not exceed the upper limit value (step S7: N), the control device 7 ends the surge tank pressure changing process.

  As described above, when the control device 7 executes the surge tank pressure changing process, the control device 7 can control the wastegate valve of the supercharger so as to shorten the time until the target surge tank pressure is obtained. it can.

  Note that the control device 7 can be implemented by modifying a part of the above-described embodiment.

  For example, the control device 7 may not have the target pressure determination unit 731. The control device 7 determines that the engine 2 is not supercharged based on the surge tank pressure detected by the surge tank pressure sensor 55, the accelerator opening obtained by the accelerator opening sensor 61, the engine load factor obtained from the surge tank pressure, and the like. The waste gate valve 58 can be controlled by determining whether or not it is in a state.

  The waste gate valve may be opened and closed to a predetermined opening by a positive pressure hydraulic controller driven by hydraulic pressure instead of the electric actuator 59 for waste gate valve driven by electric power.

  The supercharging pressure acquisition unit 733 may calculate the supercharging pressure based on the rotation speed of the compressor 50 instead of acquiring the supercharging pressure detected by the supercharging pressure sensor 51.

  Further, the supercharging mechanism 5 may include an intercooler that cools the compressed intake air between the compressor 50 and the throttle 52. At this time, the supercharging pressure sensor 51 may be arranged so as to detect the pressure between the compressor 50 and the intercooler, and may be arranged so as to detect the pressure between the intercooler and the throttle 52.

DESCRIPTION OF SYMBOLS 1 Power unit 2 Engine 50 Compressor 52 Throttle 54 Surge tank 56 Turbine 57 Bypass exhaust path 58 Wastegate valve 7 Controller 731 Target pressure determination part 732 Rotation speed acquisition part 733 Supercharging pressure acquisition part 734 Opening degree control part

Claims (6)

A turbine that is rotated by exhaust of the engine, a compressor that rotates in accordance with the rotation of the turbine and compresses the intake air of the engine, a throttle that adjusts a flow rate of the intake air compressed by the compressor, and an intake air that is adjusted by the throttle And a wastegate valve that opens and closes a bypass exhaust path for exhausting the engine exhaust without going through the turbine at any opening between fully open and fully closed. In the feeding mechanism, a control device for controlling the opening degree of the waste gate valve,
An opening degree control unit that controls the waste gate valve so that the opening degree of the bypass exhaust path is not the fully opened degree when in a non-supercharging state;
A control device comprising: A rotational speed acquisition unit for acquiring the rotational speed of the engine;
A target pressure determining unit that determines a target surge tank pressure that is a target pressure of the surge tank; and
The opening degree control unit is configured so that the opening degree of the bypass exhaust path is determined based on the engine speed and the target surge tank pressure in the non-supercharging state. The control device according to claim 1 which controls a waste gate valve.   The opening degree control unit controls the waste gate valve so that an opening degree of the bypass exhaust path is larger as a rotational speed of the engine is higher and as the target surge tank pressure is higher. 2. The control device according to 2. A supercharging pressure acquisition unit that acquires a supercharging pressure that is a pressure between the compressor and the throttle;
The opening degree control unit controls the waste gate valve so that the opening degree of the bypass exhaust path is increased by a predetermined value when the supercharging pressure exceeds an upper limit value in the non-supercharging state. The control device according to any one of claims 1 to 3.   The said opening control part controls the electric current which drives an electric actuator, and controls the said waste gate valve so that the opening degree of the said waste gate valve may be changed with the operation amount of the said electric actuator. The control device according to any one of the above. A turbine that is rotated by exhaust of the engine, a compressor that rotates in accordance with the rotation of the turbine and compresses the intake air of the engine, a throttle that adjusts a flow rate of the intake air compressed by the compressor, and an intake air that is adjusted by the throttle And a waste gate valve that opens and closes a bypass exhaust path for exhausting exhaust of the engine without passing through the turbine at any opening between fully open and fully closed. In a supercharging mechanism having a control method for controlling the opening of the waste gate valve,
An opening degree control step for controlling the waste gate valve so that the opening degree of the bypass exhaust path becomes an opening degree that is not fully opened when in a non-supercharging state;
Including a control method.

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