JP6123707B2 - Control device for internal combustion engine - Google Patents

Description

  The present invention relates to a control device for an internal combustion engine that includes a waste gate valve that opens and closes an exhaust bypass passage that bypasses an exhaust turbine of an exhaust turbine-driven supercharger.

  Some internal combustion engines mounted on vehicles are equipped with an exhaust turbine driven supercharger (so-called turbocharger) for the purpose of improving output. This exhaust turbine-driven supercharger is configured to supercharge intake air by driving a compressor provided in an intake passage with an exhaust turbine provided in an exhaust passage of an internal combustion engine.

  In an internal combustion engine equipped with an exhaust turbine-driven supercharger, for example, as described in Patent Document 1 (JP 2013-142379 A), a WGV that opens and closes an exhaust bypass passage that bypasses the exhaust turbine. There is a type in which (waste gate valve) is driven by an electric actuator. In Patent Document 1, the electric actuator is controlled based on the fully closed position of the WGV to control the opening degree of the WGV.

  However, the WGV fully closed position (reference position) may fluctuate due to steady factors such as changes over time or transient factors such as temperature changes during traveling. , The opening degree of the WGV cannot be appropriately controlled, and the control accuracy of the opening degree of the WGV may be lowered.

  Therefore, in Patent Document 1, a temperature sensor for detecting the temperature of the supercharger main body or a temperature correlated with the temperature of the supercharger main body (for example, the temperature of the catalyst) is provided, and based on the temperature detected by this temperature sensor. Thus, the control amount of the actuator of the WGV is corrected.

JP 2013-142379 A

  However, in the above-mentioned Patent Document 1, it is necessary to provide a temperature sensor for detecting the temperature of the supercharger main body or a temperature having a correlation with the temperature of the supercharger main body, which is an important technical problem in recent years. The demand for cost reduction cannot be met. If an error occurs in the temperature detected by the temperature sensor, the control amount of the WGV actuator cannot be corrected appropriately, and the control accuracy of the opening degree of the WGV may be reduced.

  Therefore, the problem to be solved by the present invention is to control an internal combustion engine that can suppress a decrease in the control accuracy of the opening degree of the WGV due to a change in the fully closed position of the WGV and can satisfy the demand for cost reduction. To provide an apparatus.

In order to solve the above-mentioned problems, an invention according to claim 1 is directed to an exhaust turbine-driven supercharger (17) for supercharging intake air of an internal combustion engine (11), and an exhaust gas from the supercharger (17). A waste gate valve (hereinafter referred to as “WGV”) (27) for opening and closing an exhaust bypass passage (26) for bypassing the turbine (18), and a WGV opening sensor (33) for detecting the opening of the WGV (27) Then, the actuator (39) of the WGV (27) is controlled so that the actual WGV opening detected by the WGV opening sensor (33) matches the target WGV opening with the fully closed position of the WGV (27) as a reference position. In the control device for an internal combustion engine including the control means (37) for executing the WGV control, the WGV (27) is within a predetermined range from the fully closed position during the execution of the WGV control, and the control value of the actuator (39) is W In a state where the control value is stuck to a value for controlling the closing direction WGV (27) of V is determined whether or not the state stuck to the value for controlling the closing direction (27), the actuator (39) If it is determined that there is a learning position, the learning means (37) for learning the reference position is provided.

  As shown in FIG. 4, when the WGV fully closed position fluctuates due to a temperature change or the like, the actual WGV opening becomes the target WGV when the WGV is controlled near the fully closed position during execution of the WGV control. The WGV may hit the fully closed position before it matches the opening. In such a case, the control value of the actuator is set to control the WGV in the closing direction (the direction in which the deviation between the target WGV opening and the actual WGV opening is reduced) even though the WGV hits the fully closed position. A state in which the WGV is attached to a value that controls the WGV in the closing direction (the actuator control value hardly changes depending on the value that controls the WGV in the closing direction).

  Paying attention to such characteristics, while the WGV control is being executed, the actuator control value is stuck to the value that controls the WGV in the closing direction near the fully closed position (within a predetermined range from the fully closed position). When this happens, it is determined that the WGV is in contact with the fully closed position, and the current position (fully closed position) of the WGV at that time is learned as a reference position. Thereby, even if the fully closed position of the WGV fluctuates due to a temperature change or the like, the WGV reference position (fully closed position) can be learned and updated with accuracy, and the WGV control can be performed based on the updated reference position. It is possible to appropriately control the opening degree of the WGV. As a result, it is possible to suppress a decrease in control accuracy of the opening degree of the WGV due to a change in the fully closed position of the WGV. In addition, it is not necessary to provide a temperature sensor for detecting the temperature of the supercharger main body or the like, and it is possible to meet the demand for cost reduction, which is an important technical problem in recent years. Also, by learning and updating the reference position of the WGV, it is possible to prevent the actuator control value from sticking to the value that controls the WGV in the closing direction, and the actuator control value sticks to Increase in power consumption and wear of the WGV and its peripheral part can also be prevented.

According to a second aspect of the present invention, there is provided an estimation means (37) for estimating a variation amount of the fully closed position based on a heat reception amount and a heat radiation amount of the exhaust system components (26, 40) of the internal combustion engine (11), It is determined whether or not the variation amount of the fully closed position is equal to or greater than a predetermined value. When it is determined that the variation amount of the fully closed position is equal to or greater than the predetermined value, WGV (27) is abutted against the fully closed position. Thus, the actuator (39) is controlled , and the learning means (37) for learning the reference position during execution of the abutting control is provided.

  That is, when the variation amount of the fully closed position is equal to or greater than a predetermined value, it is determined that the influence of the variation of the fully closed position is large, and the abutting control is performed to control the actuator so that the WGV is abutted against the fully closed position. The current position (fully closed position) of the WGV at that time is learned as a reference position. Thereby, the reference position (fully closed position) of the WGV can be learned and updated with high accuracy, and the opening degree of the WGV can be appropriately controlled by performing the WGV control based on the updated reference position. it can. Thereby, the fall of the control precision of the opening degree of WGV by the fluctuation | variation of the fully closed position of WGV can be suppressed, and the request | requirement of cost reduction can be satisfy | filled. Further, the WGV abutting control is performed only when the fluctuation amount of the fully closed position is equal to or greater than the predetermined value and the influence of the fluctuation of the fully closed position is large, and the fluctuation amount of the fully closed position is smaller than the predetermined value and When the influence of fluctuation is small, the WGV butting control can be prevented from being performed. Thereby, it can prevent that the frequency of WGV butting control increases more than necessary, and can suppress wear of WGV and its peripheral part.

The invention according to claim 4 bypasses the exhaust turbine drive supercharger (17) for supercharging the intake air of the internal combustion engine (11) and the exhaust turbine (18) of the supercharger (17). A waste gate valve (hereinafter referred to as “WGV”) (27) for opening and closing the exhaust bypass passage (26), a WGV opening sensor (33) for detecting the opening of the WGV (27), and excess intake air The WGV is configured so that the actual WGV opening detected by the WGV opening sensor (33) matches the target WGV opening with the intake pressure sensor (36) for detecting the supply pressure and the fully closed position of the WGV (27) as the reference position. The WGV control for controlling the actuator (39) of (27) is executed, and the opening correction amount of the WGV (27) is set so that the actual boost pressure detected by the intake pressure sensor (36) matches the target boost pressure. The boost pressure to be calculated The controller of an internal combustion engine and a control means (37) for executing readback control, the actual boost pressure in the boost pressure feedback control execution is determined whether a predetermined value or more, the actual boost When it is determined that the pressure is greater than or equal to a predetermined value, the correction means (37) performs a correction process of learning the reference position based on the opening correction amount of the WGV (27) or correcting the control amount of the WGV control. It is set as the structure provided with.

  As shown in FIG. 14, when the fully closed position of the WGV changes, the relationship between the WGV opening and the supercharging pressure changes accordingly, and the WGV opening correction amount by the supercharging pressure feedback control changes. Therefore, the opening correction amount of the WGV is information that reflects the fluctuation amount of the fully closed position of the WGV. However, in the region where the supercharging pressure is low, it is difficult to accurately determine the amount of change in the WGV opening correction amount due to the change in the fully closed position of the WGV.

  In consideration of such circumstances, when the actual boost pressure is greater than or equal to a predetermined value during execution of the boost pressure feedback control, the WGV opening correction amount accurately reflects the fluctuation amount of the fully closed position of the WGV. It is determined that the information is information, and the WGV reference position (fully closed position) is learned based on the WGV opening correction amount. Thereby, the reference position of the WGV can be learned and updated with high accuracy, and the opening degree of the WGV can be appropriately controlled by performing the WGV control based on the updated reference position. Alternatively, the opening degree of the WGV can be appropriately controlled by correcting the control amount of the WGV control based on the opening degree correction amount of the WGV. Thereby, the fall of the control precision of the opening degree of WGV by the fluctuation | variation of the fully closed position of WGV can be suppressed, and the request | requirement of cost reduction can be satisfy | filled. Further, there is an advantage that the correction process can be performed even in the WGV non-closed region (during a high boost pressure such as high rotation and high load).

FIG. 1 is a diagram showing a schematic configuration of an engine control system in Embodiment 1 of the present invention. FIG. 2 is a diagram showing a schematic configuration of the WGV and its peripheral part. FIG. 3 is a block diagram showing functions of WGV control. FIG. 4 is a time chart showing the behavior of the WGV opening and control duty when the fully closed position of the WGV is fluctuating. FIG. 5 is a time chart showing the behavior of the WGV opening and control duty when the fully closed position of the WGV has not changed. FIG. 6 is a flowchart showing the flow of processing of the learning routine of the first embodiment. FIG. 7 is a flowchart showing the flow of processing of the correction routine of the second embodiment. FIG. 8 is a diagram conceptually showing an example of a map of the fully closed position fluctuation amount. FIG. 9 is a flowchart showing the flow of processing of the correction routine of the third embodiment. FIG. 10 is a diagram conceptually showing an example of a map of the temperature rise amount of the exhaust system components. FIG. 11 is a time chart for explaining a reference position learning method according to the fourth embodiment. FIG. 12 is a flowchart illustrating the flow of the learning routine according to the fourth embodiment. FIG. 13 is a flowchart illustrating the flow of the learning routine according to the fifth embodiment. FIG. 14 is a diagram showing the relationship between the WGV opening and the supercharging pressure. FIG. 15 is a flowchart showing the flow of processing of the correction routine of the sixth embodiment. FIG. 16 is a flowchart showing the flow of processing of the correction routine of the seventh embodiment.

  Hereinafter, some embodiments embodying the mode for carrying out the present invention will be described.

A first embodiment of the present invention will be described with reference to FIGS.
First, a schematic configuration of the engine control system will be described with reference to FIG.
An air cleaner 13 is provided at the most upstream portion of the intake pipe 12 (intake passage) of the engine 11 that is an internal combustion engine, and an air flow meter 14 that detects the intake air amount is provided downstream of the air cleaner 13. On the other hand, the exhaust pipe 15 (exhaust passage) of the engine 11 is provided with a catalyst 16 such as a three-way catalyst for purifying CO, HC, NOx and the like in the exhaust gas.

  The engine 11 is equipped with an exhaust turbine driven supercharger 17 that supercharges intake air. In the supercharger 17, an exhaust turbine 18 is disposed on the upstream side of the catalyst 16 in the exhaust pipe 15, and a compressor 19 is disposed on the downstream side of the air flow meter 14 in the intake pipe 12. The supercharger 17 is connected so that the exhaust turbine 18 and the compressor 19 rotate integrally, and the exhaust turbine 18 is rotationally driven by the kinetic energy of the exhaust gas, so that the compressor 19 is rotationally driven to suck the intake air. It is supposed to supercharge.

  A throttle valve 21 whose opening is adjusted by a motor 20 and a throttle opening sensor 22 that detects the opening (throttle opening) of the throttle valve 21 are provided on the downstream side of the compressor 19 in the intake pipe 12. It has been.

  Further, an intercooler (not shown) for cooling the intake air is provided integrally with the surge tank 23 on the downstream side of the throttle valve 21. Alternatively, an intercooler may be disposed upstream of the surge tank 23 and the throttle valve 21. The surge tank 23 is provided with an intake manifold 24 that introduces air into each cylinder of the engine 11, and a fuel injection valve (not shown) that performs in-cylinder injection or intake port injection is attached to each cylinder. An ignition plug (not shown) is attached to the cylinder head of the engine 11 for each cylinder, and the air-fuel mixture in each cylinder is ignited by spark discharge of each ignition plug.

  An exhaust manifold 25 is connected to the exhaust port of each cylinder of the engine 11, and a downstream collecting portion of the exhaust manifold 25 of each cylinder is connected to an exhaust pipe 15 upstream of the exhaust turbine 18. Further, an exhaust bypass passage 26 for bypassing the upstream side and the downstream side of the exhaust turbine 18 is provided, and a waste gate valve (hereinafter referred to as “WGV”) 27 for opening and closing the exhaust bypass passage 26 is provided in the exhaust bypass passage 26. Is provided.

  As shown in FIG. 2, the WGV 27 is connected to the rod 40 of the electric actuator 39 via the link mechanism 38, and adjusts the opening degree of the WGV 27 by controlling the stroke amount of the electric actuator 39 (stroke amount of the rod 40). It is supposed to be. A WGV opening sensor 33 that detects the opening of the WGV 27 is provided at or near the electric actuator 39. The WGV opening sensor 33 detects, for example, the stroke amount of the electric actuator 39 or the movement amount of the WGV 27 as information on the opening degree of the WGV 27.

  As shown in FIG. 1, the engine 11 is provided with a coolant temperature sensor 34 that detects the coolant temperature, a crank angle sensor 35 that outputs a pulse signal each time a crankshaft (not shown) rotates a predetermined crank angle, and the like. The crank angle and the engine speed are detected based on the output signal of the crank angle sensor 35. Further, an intake pressure sensor 36 that detects a supercharging pressure of intake air (an intake pressure upstream of the throttle valve 21) is provided on the upstream side of the throttle valve 21 in the intake pipe 12.

  Outputs of these various sensors are input to an electronic control unit (hereinafter referred to as “ECU”) 37. The ECU 37 is mainly composed of a microcomputer, and executes various engine control programs stored in a built-in ROM (storage medium), so that the fuel injection amount and the ignition timing are determined according to the engine operating state. The throttle opening (intake air amount) and the like are controlled.

  The ECU 37 (control means) controls the electric actuator 39 of the WGV 27 so that the actual WGV opening detected by the WGV opening sensor 33 matches the target WGV opening with the fully closed position of the WGV 27 as a reference position. Execute control. At that time, the supercharging pressure F / B control is performed to calculate the WGV opening correction amount (opening correction amount of WGV27) so that the actual supercharging pressure detected by the intake pressure sensor 36 matches the target supercharging pressure. . Here, “F / B” means “feedback” (hereinafter the same).

  Specifically, as shown in FIG. 3, the ECU 37 is a base WGV opening calculation unit 41 that maps the base WGV opening based on the engine operating state (for example, the accelerator opening and the engine rotation speed, etc.) Calculated by Further, the target supercharging pressure calculation unit 42 calculates the target supercharging pressure using a map or a mathematical formula based on the engine operating state (for example, the accelerator opening and the engine speed).

  Thereafter, the WGV opening correction amount calculation unit 43 calculates the WGV opening correction amount so as to reduce the deviation between the target boost pressure and the actual boost pressure detected by the intake pressure sensor 36, and the target WGV opening correction amount is calculated. The calculation unit 44 adds the WGV opening correction amount to the base WGV opening to obtain the target WGV opening.

  Thereafter, the WGV opening control unit 45 calculates the control duty (control value) of the electric actuator 39 so as to reduce the deviation between the target WGV opening and the actual WGV opening detected by the WGV opening sensor 33. The opening of the WGV 27 is controlled by controlling the drive voltage (or drive current) of the electric actuator 39 with this control duty.

  However, the fully closed position (reference position) of the WGV 27 may fluctuate due to a steady factor due to a change over time or a transient factor due to a temperature change during traveling, etc. When the fully closed position of the WGV 27 fluctuates. , The opening degree of the WGV 27 cannot be appropriately controlled, and the control accuracy of the opening degree of the WGV 27 may be lowered.

  As a countermeasure against this, in the first embodiment, the correction processing unit 46 causes the control duty of the electric actuator 39 to close the WGV 27 in the closing direction when the WGV 27 is in the vicinity of the fully closed position (within a predetermined range from the fully closed position). A correction process for learning the reference position of the WGV 27 is performed when the control value is stuck (see FIG. 4). This function is realized by executing a learning routine of FIG.

  As shown in FIG. 5, when the fully closed position of the WGV 27 is not changed, the control duty of the electric actuator 39 is set so as to reduce the deviation between the target WGV opening and the actual WGV opening during execution of the WGV control. Is calculated, and the actual WGV opening coincides with the target WGV opening.

  On the other hand, as shown in FIG. 4, if the fully closed position of the WGV 27 fluctuates due to a temperature change or the like, when the WGV 27 is controlled near the fully closed position during execution of the WGV control, the actual WGV Before the opening degree matches the target WGV opening degree, the WGV 27 may hit the fully closed position. In such a case, the control of the electric actuator 39 is attempted to control the WGV 27 in the closing direction (the direction in which the deviation between the target WGV opening and the actual WGV opening is reduced) even though the WGV 27 is in contact with the fully closed position. The duty is stuck to a value that controls the WGV 27 in the closing direction (a state in which the control duty of the electric actuator 39 hardly changes depending on the value that controls the WGV 27 in the closing direction).

  Focusing on such characteristics, in the first embodiment, while the WGV control is being executed, the WGV 27 is in the vicinity of the fully closed position (within a predetermined range from the fully closed position), and the control duty of the electric actuator 39 controls the WGV 27 in the closing direction. When the value is stuck to the value to be determined, it is determined that the WGV 27 is in contact with the fully closed position, and the current position (fully closed position) of the WGV 27 at that time is learned as a reference position. Thereby, the reference position (fully closed position) of the WGV 27 is accurately learned and updated, and the opening degree of the WGV 27 can be appropriately controlled by performing the WGV control based on the updated reference position.

Hereinafter, the processing content of the learning routine of FIG. 6 executed by the ECU 37 in the first embodiment will be described.
The learning routine shown in FIG. 6 is repeatedly executed at a predetermined period during the power-on period of the ECU 37, and serves as learning means in the claims.

When this routine is started, first, at step 101, it is determined whether or not WGV control is being executed.
If it is determined in step 101 that the WGV control is not being executed, this routine is terminated without executing the processing from step 102 onward.

  On the other hand, if it is determined in step 101 that the WGV control is being executed, the process proceeds to step 102, and the opening degree of the WGV 27 (actual WGV opening degree or target WGV opening degree) is read.

Thereafter, the process proceeds to step 103, where whether or not the WGV 27 is near the fully closed position (within a predetermined range from the fully closed position), the actual WGV opening is within the predetermined range from the fully closed position (current reference position). Whether or not the target WGV opening is within a predetermined range from the fully closed position (current reference position). Here, the predetermined range is set to, for example, a variation range (variation range) of the fully closed position of the WGV 27 due to a temperature change or the like, or a slightly wider range.
If it is determined in step 103 that the WGV 27 is not in the vicinity of the fully closed position, this routine is terminated without executing the processing from step 104 onward.

  On the other hand, if it is determined in step 103 that the WGV 27 is near the fully closed position, the process proceeds to step 104, where the control duty of the electric actuator 39 is stuck to a value that controls the WGV 27 in the closing direction (electric It is determined whether or not the control duty of the actuator 39 is a state in which the control duty of the WGV 27 is hardly changed by a value for controlling the WGV 27 in the closing direction.

  If it is determined in step 104 that the control duty of the electric actuator 39 is not stuck to a value that controls the WGV 27 in the closing direction, the processing of step 105 (reference position learning) is not performed. This routine is terminated.

  On the other hand, if it is determined in step 104 that the control duty of the electric actuator 39 is stuck to a value that controls the WGV 27 in the closing direction, it is determined that the WGV 27 has hit the fully closed position. In step 105, the reference position (fully closed position) of the WGV 27 is learned and updated. Specifically, the current position (fully closed position) of the WGV 27 is learned as a reference position, and the learning value of the reference position stored in the memory of the ECU 37 is updated with the current learning value. When the reference position is updated, the ECU 37 performs WGV control based on the updated reference position, for example, by correcting the target WGV opening or the actual WGV opening based on the updated reference position.

  In the first embodiment described above, while the WGV control is being executed, the WGV 27 is in the vicinity of the fully closed position (within a predetermined range from the fully closed position), and the control duty of the electric actuator 39 sticks to a value that controls the WGV 27 in the closing direction. When the state is reached, it is determined that the WGV 27 is in contact with the fully closed position, and the current position (fully closed position) of the WGV 27 at that time is learned as a reference position. As a result, even if the fully closed position of the WGV 27 fluctuates due to a temperature change or the like, the reference position (fully closed position) of the WGV 27 can be learned and updated with accuracy, and the WGV control is performed based on the updated reference position. By performing this, the opening degree of the WGV 27 can be appropriately controlled. As a result, it is possible to suppress a decrease in the control accuracy of the opening degree of the WGV 27 due to a change in the fully closed position of the WGV 27. In addition, it is not necessary to provide a temperature sensor for detecting the temperature of the supercharger main body or the like, and it is possible to meet the demand for cost reduction, which is an important technical problem in recent years. Further, by learning and updating the reference position of the WGV 27, it is possible to prevent the control duty of the electric actuator 39 from sticking to a value that controls the WGV 27 in the closing direction. It is also possible to prevent an increase in power consumption due to sticking of the duty and wear of the WGV 27 and its peripheral part.

  Next, Embodiment 2 of the present invention will be described with reference to FIGS. However, description of substantially the same parts as those in the first embodiment will be omitted or simplified, and different parts from the first embodiment will be mainly described.

  In the second embodiment, the ECU 37 executes a correction routine shown in FIG. 7 to be described later, thereby estimating the fluctuation amount of the fully closed position of the WGV 27 based on the heat receiving amount and the heat radiation amount of the exhaust system components of the engine 11. Based on the variation amount of the fully closed position, the correction process for learning the reference position of the WGV 27 or correcting the control amount of the WGV control is performed.

  The temperature of the exhaust system components changes according to the amount of heat received and the amount of heat released from the exhaust system components (for example, the exhaust bypass passage 26 and the rod 40 of the electric actuator 39), and the exhaust system configuration according to the temperature of the exhaust system components The fully expanded position of the WGV 27 fluctuates due to thermal expansion and contraction of the parts.

  Therefore, the fluctuation amount of the fully closed position can be accurately estimated by estimating the fluctuation amount of the fully closed position based on the heat receiving amount and the heat radiation amount of the exhaust system components. By learning the reference position (fully closed position) of the WGV 27 based on the variation amount of the fully closed position, the reference position of the WGV 27 is accurately learned and updated, and the WGV control is performed based on the updated reference position. By doing so, the opening degree of the WGV 27 can be appropriately controlled. Alternatively, the opening degree of the WGV 27 can be appropriately controlled by correcting the control amount (for example, the target WGV opening degree or the control duty) of the WGV control based on the fluctuation amount of the fully closed position.

Hereinafter, the processing content of the correction routine of FIG. 7 executed by the ECU 37 in the second embodiment will be described.
The correction routine shown in FIG. 7 is repeatedly executed at a predetermined period during the power-on period of the ECU 37, and serves as an estimation unit and a correction unit in the scope of claims.

  When this routine is started, first, in step 201, the exhaust system components of the engine 11 (for example, components that affect the fluctuation of the fully closed position of the WGV 27 such as the exhaust bypass passage 26 and the rod 40 of the electric actuator 39) are received. Calculate heat and heat dissipation. In this case, for example, the exhaust heat amount is calculated based on the exhaust gas amount and the exhaust gas temperature, and the heat reception amount of the exhaust system components is calculated based on the exhaust heat amount using a map or a mathematical expression. Further, the heat release amount of the exhaust system components is calculated by a map or a mathematical formula based on the vehicle speed (wind speed or air volume) and the outside air temperature.

  Thereafter, the process proceeds to step 202, and referring to the map of the fully closed position fluctuation amount shown in FIG. 8, the fluctuation amount of the fully closed position corresponding to the heat receiving amount and the heat radiation amount of the exhaust system components is calculated. Estimate the amount of variation in the closed position. The map of the fully closed position fluctuation amount is set, for example, such that the larger the amount of heat received, the larger the fluctuation amount of the fully closed position, and the smaller the heat release amount, the larger the fluctuation amount of the fully closed position. The map of the fully closed position fluctuation amount is created in advance based on test data, design data, and the like, and is stored in the ROM of the ECU 37. Note that the fluctuation amount of the fully closed position may be calculated by a mathematical expression (for example, a physical model or a physical expression) based on the heat receiving amount and the heat radiation amount of the exhaust system components.

  Thereafter, the process proceeds to step 203, where it is determined whether or not the variation amount of the fully closed position is equal to or greater than a predetermined value. This predetermined value is set to, for example, the upper limit value of the variation amount of the fully closed position at which the influence of the variation of the fully closed position is within the allowable range or a value in the vicinity thereof.

  If it is determined in step 203 that the amount of change in the fully closed position is smaller than a predetermined value, it is determined that the influence of the change in the fully closed position is small, and the processing in step 204 (correction processing) is executed. This routine is terminated without any processing.

  On the other hand, if it is determined in step 203 that the amount of change in the fully closed position is greater than or equal to a predetermined value, it is determined that the influence of the change in the fully closed position is large, and the process proceeds to step 204 where correction processing is performed. . In this correction process, the reference position is learned and updated based on the fluctuation amount of the fully closed position. Specifically, the learning value of the current reference position is corrected based on the variation amount of the fully closed position, and the learning value of the reference position stored in the memory of the ECU 37 is updated with the current learning value. Alternatively, the control amount of the WGV control (for example, the target WGV opening or control duty) is corrected based on the variation amount of the fully closed position.

  At this time, all of the fluctuation amount of the fully closed position may be reflected in the correction process (learning of the reference position or correction of the control amount), or a part of the fluctuation amount of the fully closed position (for example, (1/4, 1/3, 1/2, etc.) may be reflected in the correction process. By reflecting all of the fluctuation amount of the fully closed position in the correction process, the reference position and the control amount can be changed with good response to the fluctuation of the fully closed position, and the opening degree of the WGV 27 can be corrected quickly. it can. On the other hand, by reflecting a part of the fluctuation amount of the fully closed position in the correction process, the reference position and the control amount can be gradually changed, and a sudden change in the opening degree of the WGV 27 can be suppressed.

  In the second embodiment described above, the fluctuation amount of the fully closed position of the WGV 27 is estimated based on the heat receiving amount and the heat radiation amount of the exhaust system components of the engine 11, and the WGV 27 of the WGV 27 is calculated based on the estimated fluctuation amount of the fully closed position. Correction processing for learning the reference position or correcting the control amount of the WGV control is performed. The temperature of the exhaust system component changes according to the amount of heat received and the amount of heat released from the exhaust system component, and the exhaust system component thermally expands and contracts according to the temperature of the exhaust system component, so that the fully closed position of the WGV 27 is set. Therefore, the fluctuation amount of the fully closed position can be accurately estimated by estimating the fluctuation amount of the fully closed position based on the heat receiving amount and the heat radiation amount of the exhaust system components. By learning the reference position (fully closed position) of the WGV 27 based on the variation amount of the fully closed position, the reference position of the WGV 27 can be accurately learned and updated, and the updated reference position is used as a reference. By performing the WGV control, the opening degree of the WGV 27 can be appropriately controlled. Alternatively, the opening degree of the WGV 27 can be appropriately controlled by correcting the control amount of the WGV control based on the fluctuation amount of the fully closed position. Thereby, the fall of the control precision of the opening degree of WGV27 by the fluctuation | variation of the fully closed position of WGV27 can be suppressed, and the request | requirement of cost reduction can be satisfy | filled.

  In the second embodiment, the correction process is performed when the variation amount of the fully closed position is equal to or greater than a predetermined value. In this way, the correction process is performed only when the fluctuation amount of the fully closed position is greater than or equal to the predetermined value and the influence of the fluctuation of the fully closed position is large, and the fluctuation amount of the fully closed position is smaller than the predetermined value and the fully closed position is It is possible to prevent the correction process from being performed when the influence of the fluctuations in the number is small. Thereby, it is possible to prevent the correction process from being performed more than necessary.

  Next, Embodiment 3 of the present invention will be described with reference to FIGS. However, description of substantially the same parts as those of the second embodiment will be omitted or simplified, and different parts from the second embodiment will be mainly described.

  In the third embodiment, the ECU 37 executes a correction routine shown in FIG. 9 to be described later, thereby calculating the temperature of the exhaust system component based on the amount of heat received and the amount of heat released from the exhaust system component of the engine 11. The variation amount of the fully closed position of the WGV 27 is estimated based on the temperature of the part. Then, a correction process for learning the reference position of the WGV 27 or correcting the control amount of the WGV control based on the estimated variation amount of the fully closed position is performed.

Hereinafter, the processing content of the correction routine of FIG. 9 executed by the ECU 37 in the third embodiment will be described.
In the correction routine of FIG. 9, first, in step 301, the amount of heat received by the exhaust system components of the engine 11 (for example, the parts that affect the fluctuation of the fully closed position of the WGV 27 such as the exhaust bypass passage 26 and the rod 40 of the electric actuator 39). Calculate the heat dissipation.

  Thereafter, the process proceeds to step 302, and the temperature increase amount of the exhaust system component is calculated according to the heat receiving amount and the heat radiation amount of the exhaust system component with reference to the map of the temperature increase amount of the exhaust system component shown in FIG. Then, the temperature of the exhaust system component is calculated by adding this amount of temperature rise to the previous value of the temperature of the exhaust system component. The map of the temperature rise amount of the exhaust system component is, for example, such that the temperature rise amount of the exhaust system component increases as the amount of heat received increases, and the temperature increase amount of the exhaust system component increases as the heat dissipation amount decreases. Is set. The map of the temperature rise amount of the exhaust system components is created in advance based on test data, design data, and the like, and is stored in the ROM of the ECU 37. It should be noted that the temperature or temperature rise amount of the exhaust system component may be calculated by a mathematical formula (for example, a physical model or a physical formula) based on the heat receiving amount and the heat radiation amount of the exhaust system component.

  Thereafter, the process proceeds to step 303, where the amount of change in the fully closed position is estimated by calculating the amount of change in the fully closed position based on the temperature of the exhaust system components using a map or a mathematical expression. The map or mathematical expression of the fully closed position variation is created in advance based on test data, design data, and the like, and stored in the ROM of the ECU 37.

  Thereafter, the process proceeds to step 304, where it is determined whether or not the variation amount of the fully closed position is greater than or equal to a predetermined value. If it is determined in step 304 that the variation amount of the fully closed position is smaller than a predetermined value, it is determined that the influence of the variation of the fully closed position is small, and the processing of step 305 (correction processing) is executed. This routine is terminated without any processing.

  On the other hand, if it is determined in step 304 that the variation amount of the fully closed position is greater than or equal to a predetermined value, it is determined that the influence of the variation of the fully closed position is large, and the process proceeds to step 305 to perform correction processing. . In this correction process, the reference position is learned and updated based on the fluctuation amount of the fully closed position. Alternatively, the control amount of the WGV control is corrected based on the fluctuation amount of the fully closed position. At this time, all of the fluctuation amount of the fully closed position may be reflected in the correction process (learning of the reference position and correction of the control amount), or a part of the fluctuation amount of the fully closed position may be corrected. You may make it reflect in.

  In the third embodiment described above, the temperature of the exhaust system component is calculated based on the amount of heat received and the amount of heat released from the exhaust system component of the engine 11, and the WGV 27 is fully closed based on the temperature of the exhaust system component. The amount of fluctuation is estimated. Even in this case, the variation amount of the fully closed position of the WGV 27 can be accurately estimated. Then, based on the estimated variation amount of the fully closed position, the reference position (fully closed position) of the WGV 27 is learned, or the correction process for correcting the control amount of the WGV control is performed, so that substantially the same effect as the second embodiment is obtained. Can be obtained.

  In each of the embodiments 2 and 3, the correction process is performed when the fluctuation amount of the fully closed position is equal to or greater than a predetermined value. However, the present invention is not limited to this, and the correction processing is not limited to this. First, correction processing may be performed.

  Next, Embodiment 4 of the present invention will be described with reference to FIGS. However, description of substantially the same parts as those of the second embodiment will be omitted or simplified, and different parts from the second embodiment will be mainly described.

  In the fourth embodiment, the ECU 37 executes a learning routine shown in FIG. 12 to be described later, thereby estimating the fluctuation amount of the fully closed position of the WGV 27 based on the heat receiving amount and the heat radiation amount of the exhaust system components of the engine 11. The electric actuator 39 is controlled to learn the reference position of the WGV 27 so that the WGV 27 abuts the fully closed position when the variation amount of the fully closed position is greater than or equal to a predetermined value.

  Specifically, as shown in FIG. 11, first, the fully closed position of the WGV 27 based on the amount of heat received and the amount of heat released by the exhaust system components of the engine 11 (for example, the exhaust bypass passage 26 and the rod 40 of the electric actuator 39). Estimate the amount of fluctuation. Then, at time t1 when the estimated amount of change in the fully closed position exceeds a predetermined value, it is determined that the influence of the change in the fully closed position is large, and the electric actuator 39 is controlled so that the WGV 27 is brought into contact with the fully closed position. The butt control is performed. During the execution of the abutting control, the current position (fully closed position) of the WGV at that time is learned as a reference position. Thereby, the reference position (fully closed position) of the WGV 27 is accurately learned and updated, and the opening degree of the WGV 27 can be appropriately controlled by performing the WGV control based on the updated reference position.

Hereinafter, the processing content of the learning routine of FIG. 12 executed by the ECU 37 in the fourth embodiment will be described.
The learning routine shown in FIG. 12 is repeatedly executed at a predetermined cycle during the power-on period of the ECU 37, and plays a role as estimation means and learning means in the claims.

  When this routine is started, first, in step 401, the exhaust system components of the engine 11 (for example, components that affect the fluctuation of the fully closed position of the WGV 27 such as the exhaust bypass passage 26 and the rod 40 of the electric actuator 39) are received. Calculate heat and heat dissipation.

  Thereafter, the process proceeds to step 402, and referring to the fully closed position fluctuation amount map shown in FIG. 8, the fluctuation amount of the fully closed position corresponding to the heat receiving amount and the heat radiation amount of the exhaust system components is calculated. Estimate the amount of variation in the closed position. Note that the fluctuation amount of the fully closed position may be calculated by a mathematical expression (for example, a physical model or a physical expression) based on the heat receiving amount and the heat radiation amount of the exhaust system components.

  Thereafter, the process proceeds to step 403, where it is determined whether or not the variation amount of the fully closed position is equal to or greater than a predetermined value. If it is determined in step 403 that the variation amount of the fully closed position is smaller than the predetermined value, it is determined that the influence of the variation of the fully closed position is small, and the processing after step 404 (abutting control and reference) This routine is terminated without executing (position learning).

  On the other hand, if it is determined in step 403 that the variation amount of the fully closed position is greater than or equal to a predetermined value, it is determined that the influence of the variation of the fully closed position is large, and the process proceeds to step 404 to perform the abutting control. Run. In this butting control, the electric actuator 39 is controlled so that the WGV 27 is butted against the fully closed position.

  Thereafter, the process proceeds to step 405, where the reference position (fully closed position) of the WGV 27 is learned and updated. Specifically, the current position (fully closed position) of the WGV 27 is learned as a reference position, and the learning value of the reference position stored in the memory of the ECU 37 is updated with the current learning value. After updating the reference position, the abutting control is terminated and the normal WGV control is resumed.

  In the fourth embodiment described above, when the estimated variation amount of the fully closed position is equal to or greater than a predetermined value, it is determined that the influence of the variation of the fully closed position is large, and the WGV 27 is electrically driven so as to strike the fully closed position. Abutting control for controlling the actuator 39 is performed, and the current position (fully closed position) of the WGV at that time is learned as a reference position. Thereby, the reference position (fully closed position) of the WGV 27 can be accurately learned and updated, and the opening degree of the WGV 27 can be appropriately controlled by performing the WGV control based on the updated reference position. it can. Thereby, the fall of the control precision of the opening degree of WGV27 by the fluctuation | variation of the fully closed position of WGV27 can be suppressed, and the request | requirement of cost reduction can be satisfy | filled. In addition, the WGV 27 is controlled only when the variation amount of the fully closed position is equal to or greater than the predetermined value and the influence of the variation of the fully closed position is large, and the variation amount of the fully closed position is smaller than the predetermined value and When the influence due to the fluctuation is small, the WGV 27 butting control can be prevented from being performed. Thereby, it can prevent that the frequency of butt control of WGV27 increases more than necessary, and can suppress wear of WGV27 or its peripheral part.

  Next, Embodiment 5 of the present invention will be described with reference to FIG. However, description of substantially the same parts as those in the fourth embodiment will be omitted or simplified, and different parts from the fourth embodiment will be mainly described.

  In the fifth embodiment, the ECU 37 calculates the temperature of the exhaust system components based on the amount of heat received and radiated from the exhaust system components of the engine 11 by executing a learning routine shown in FIG. The variation amount of the fully closed position of the WGV 27 is estimated based on the temperature of the part. Then, when the estimated variation amount of the fully closed position is equal to or greater than a predetermined value, the electric actuator 39 is controlled so as to abut the WGV 27 against the fully closed position to learn the WGV reference position.

Hereinafter, the processing content of the learning routine of FIG. 13 executed by the ECU 37 in the fifth embodiment will be described.
In the learning routine of FIG. 13, first, in step 501, the amount of heat received by the exhaust system components of the engine 11 (for example, components that affect the fluctuation of the fully closed position of the WGV 27 such as the exhaust bypass passage 26 and the rod 40 of the electric actuator 39). Calculate the heat dissipation.

  Thereafter, the process proceeds to step 502, and the temperature rise amount of the exhaust system component is calculated according to the amount of heat received and the amount of heat released from the exhaust system component by referring to the map of the temperature rise amount of the exhaust system component shown in FIG. Then, the temperature of the exhaust system component is calculated by adding this amount of temperature rise to the previous value of the temperature of the exhaust system component. It should be noted that the temperature or temperature rise amount of the exhaust system component may be calculated by a mathematical formula (for example, a physical model or a physical formula) based on the heat receiving amount and the heat radiation amount of the exhaust system component.

Thereafter, the process proceeds to step 503, where the fluctuation amount of the fully closed position is estimated by calculating the fluctuation amount of the fully closed position based on the temperature of the exhaust system components by using a map or a mathematical expression.
Thereafter, the process proceeds to step 504, where it is determined whether or not the variation amount of the fully closed position is a predetermined value or more. If it is determined in step 504 that the variation amount of the fully closed position is smaller than a predetermined value, it is determined that the influence of the variation of the fully closed position is small, and the processing after step 505 (abutting control and reference) This routine is terminated without executing (position learning).

On the other hand, if it is determined in step 504 that the variation amount of the fully closed position is greater than or equal to a predetermined value, it is determined that the influence of the variation of the fully closed position is large, and the process proceeds to step 505 to perform the abutting control. After the execution, the process proceeds to step 506, where the reference position (fully closed position) of the WGV 27 is learned and updated. After updating the reference position, the abutting control is terminated and the normal WGV control is resumed.
In the fifth embodiment described above, substantially the same effect as in the fourth embodiment can be obtained.

  Next, Embodiment 6 of the present invention will be described with reference to FIGS. 14 and 15. However, description of substantially the same parts as those in the first embodiment will be omitted or simplified, and different parts from the first embodiment will be mainly described.

  In the sixth embodiment, a correction routine of FIG. 15 described later is executed by the ECU 37, so that the WGV opening correction amount (WGV27) when the actual supercharging pressure is equal to or greater than a predetermined value during execution of the supercharging pressure F / B control. The correction processing is performed to learn the reference position or to correct the control amount of the WGV control based on (the opening correction amount).

  As shown in FIG. 14, when the fully closed position of the WGV 27 changes, the relationship between the opening degree of the WGV 27 and the supercharging pressure changes accordingly, and the WGV opening correction amount by the supercharging pressure F / B control changes. Therefore, the WGV opening correction amount is information reflecting the variation amount of the fully closed position of the WGV 27. However, in the region where the supercharging pressure is low, it is difficult to accurately determine the amount of change in the WGV opening correction amount due to the change in the fully closed position of the WGV 27.

  In consideration of such circumstances, in the sixth embodiment, when the actual supercharging pressure is equal to or greater than a predetermined value during execution of the supercharging pressure F / B control, the WGV opening correction amount is the WGV27 fully closed position. It is determined that the information accurately reflects the fluctuation amount, and the reference position (fully closed position) of the WGV 27 is learned based on the WGV opening correction amount. Accordingly, the reference position of the WGV 27 is learned and updated with high accuracy, and the opening degree of the WGV 27 can be appropriately controlled by performing the WGV control based on the updated reference position. Alternatively, the opening degree of the WGV 27 can be appropriately controlled by correcting the control amount (for example, the target WGV opening degree or the control duty) of the WGV control based on the WGV opening degree correction amount.

Hereinafter, the processing content of the correction routine of FIG. 15 executed by the ECU 37 in the sixth embodiment will be described.
The correction routine shown in FIG. 15 is repeatedly executed at a predetermined cycle during the power-on period of the ECU 37, and serves as correction means in the claims.

When this routine is started, first, at step 601, it is determined whether or not the supercharging pressure F / B control is being executed.
If it is determined in step 601 that the supercharging pressure F / B control is not being executed, this routine is terminated without executing the processing from step 602 onward.

On the other hand, if it is determined in step 601 that the supercharging pressure F / B control is being executed, the process proceeds to step 602, where it is determined whether or not the actual supercharging pressure is greater than or equal to a predetermined value. For example, the predetermined value is set to the minimum value of the supercharging pressure or a value in the vicinity thereof, which is information in which the WGV opening correction amount accurately reflects the fluctuation amount of the fully closed position of the WGV27.
If it is determined in step 602 that the actual supercharging pressure is lower than the predetermined value, this routine is terminated without executing the processing after step 603.

  On the other hand, if it is determined in step 602 that the actual boost pressure is greater than or equal to the predetermined value, it is determined that the WGV opening correction amount is information that accurately reflects the amount of change in the fully closed position of the WGV 27. In step 603, the WGV opening correction amount by the supercharging pressure F / B control is read.

  Thereafter, the process proceeds to step 604, where it is determined whether or not the WGV opening correction amount is equal to or greater than a predetermined value. This predetermined value is set to, for example, a WGV opening correction amount corresponding to the upper limit value of the variation amount of the fully closed position where the influence of the variation of the fully closed position is within the allowable range or a value in the vicinity thereof.

  If it is determined in step 604 that the WGV opening correction amount is smaller than the predetermined value, it is determined that the influence of the change in the fully closed position is small, and the processing (correction processing) in step 605 is executed. This routine is terminated.

  On the other hand, if it is determined in step 604 that the WGV opening correction amount is greater than or equal to the predetermined value, it is determined that the influence of the change in the fully closed position is large, and the process proceeds to step 605 to perform correction processing. In this correction process, the reference position is learned and updated based on the WGV opening correction amount. Specifically, the learning value of the current reference position is corrected based on the WGV opening correction amount, and the learning value of the reference position stored in the memory of the ECU 37 is updated with the current learning value. Alternatively, the control amount of the WGV control (for example, the target WGV opening or the control duty) is corrected based on the WGV opening correction amount.

  At this time, all of the WGV opening correction amount may be reflected in the correction process (learning of the reference position and correction of the control amount), or a part of the WGV opening correction amount (for example, 1 / (4, 1/3, 1/2, etc.) may be reflected in the correction process. By reflecting the entire WGV opening correction amount in the correction process, it is possible to change the reference position and the control amount with good response to fluctuations in the fully closed position, and to quickly correct the opening of the WGV 27. . On the other hand, by reflecting a part of the WGV opening correction amount in the correction process, the reference position and the control amount can be gradually changed, and a sudden change in the opening of the WGV 27 can be suppressed.

  In the sixth embodiment described above, the WGV opening correction amount accurately reflects the fluctuation amount of the fully closed position of the WGV 27 when the actual supercharging pressure is equal to or greater than a predetermined value during execution of the supercharging pressure F / B control. Thus, the correction processing is performed to learn the reference position based on the WGV opening correction amount or to correct the control amount of the WGV control. By learning the reference position (fully closed position) of the WGV 27 based on the WGV opening correction amount, the reference position of the WGV 27 can be learned and updated with accuracy, and the WGV control is performed based on the updated reference position. By performing this, the opening degree of the WGV 27 can be appropriately controlled. Alternatively, the opening degree of the WGV 27 can be appropriately controlled by correcting the control amount of the WGV control based on the WGV opening degree correction amount. Thereby, the fall of the control precision of the opening degree of WGV27 by the fluctuation | variation of the fully closed position of WGV27 can be suppressed, and the request | requirement of cost reduction can be satisfy | filled. In addition, there is an advantage that the correction process can be performed even in the WGV 27 non-closed region (during a high boost pressure such as high rotation and high load).

  In the sixth embodiment, correction processing is performed when the WGV opening correction amount is equal to or greater than a predetermined value. In this way, correction processing is performed only when the WGV opening correction amount is greater than or equal to a predetermined value and the influence of fluctuations in the fully closed position is large, and the WGV opening correction amount is smaller than the predetermined value and fluctuations in the fully closed position are performed. When the influence of is small, it is possible to prevent the correction process from being performed. Thereby, it is possible to prevent the correction process from being performed more than necessary.

  Next, Embodiment 7 of the present invention will be described with reference to FIG. However, description of substantially the same parts as in the sixth embodiment will be omitted or simplified, and different parts from the sixth embodiment will be mainly described.

  In the seventh embodiment, the ECU 37 executes a correction routine shown in FIG. 16, which will be described later, to set the target supercharging pressure to a predetermined value or more when a predetermined condition is satisfied during execution of the supercharging pressure F / B control. Thus, the actual supercharging pressure is controlled to a predetermined value or more. Then, when the actual supercharging pressure is equal to or greater than a predetermined value, a correction process for learning the reference position based on the WGV opening correction amount or correcting the control amount of the WGV control is performed.

Hereinafter, the processing content of the correction routine of FIG. 16 executed by the ECU 37 in the seventh embodiment will be described.
In the correction routine of FIG. 16, first, in step 701, it is determined whether or not the supercharging pressure F / B control is being executed, and if it is determined that the supercharging pressure F / B control is not being executed. Terminates this routine without executing the processing from step 702 onward.

On the other hand, if it is determined in step 701 that the supercharging pressure F / B control is being executed, the process proceeds to step 702 to determine whether or not a predetermined condition is satisfied, for example, the fully closed position of the WGV 27. It is determined by whether or not the fluctuation amount is greater than or equal to a predetermined value, whether or not a predetermined period has elapsed since the previous correction process was performed, and the like. Here, whether or not the variation amount of the fully closed position of the WGV 27 is greater than or equal to a predetermined value is determined by the method described in the second to fifth embodiments.
If it is determined in step 702 that the predetermined condition is not satisfied, this routine is terminated without executing the processing in step 703 and subsequent steps.

  On the other hand, if it is determined in step 702 that the predetermined condition is satisfied, the process proceeds to step 703, where the target supercharging pressure is set to a predetermined value or more. For example, the predetermined value is set to the minimum value of the supercharging pressure or a value in the vicinity thereof, which is information in which the WGV opening correction amount accurately reflects the fluctuation amount of the fully closed position of the WGV27.

  Thereafter, the process proceeds to step 704, where it is determined whether or not the actual supercharging pressure is greater than or equal to a predetermined value. If it is determined in step 704 that the actual supercharging pressure is lower than the predetermined value, this routine is terminated without executing the processing from step 705 onward.

  On the other hand, if it is determined in step 704 that the actual boost pressure is greater than or equal to the predetermined value, it is determined that the WGV opening correction amount is information that accurately reflects the amount of change in the fully closed position of the WGV 27. In step 705, the WGV opening correction amount by the supercharging pressure F / B control is read.

  Thereafter, the process proceeds to step 706, where it is determined whether or not the WGV opening correction amount is equal to or greater than a predetermined value. If it is determined in step 706 that the WGV opening correction amount is smaller than the predetermined value, it is determined that the influence of the change in the fully closed position is small, and the processing of step 707 (correction processing) is executed. This routine is terminated.

  On the other hand, if it is determined in step 706 that the WGV opening correction amount is equal to or greater than the predetermined value, it is determined that the influence of the change in the fully closed position is large, and the process proceeds to step 707 where correction processing is performed. In this correction process, the reference position is learned and updated based on the WGV opening correction amount. Alternatively, the control amount of the WGV control is corrected based on the WGV opening correction amount. At this time, all of the WGV opening correction amount may be reflected in the correction process (learning of the reference position and control amount correction), or a part of the WGV opening correction amount may be reflected in the correction process. You may make it let it.

  In the seventh embodiment described above, when a predetermined condition is satisfied during execution of the supercharging pressure F / B control, the target supercharging pressure is set to a predetermined value or more to control the actual supercharging pressure to a predetermined value or more. I am doing so. In this way, when the predetermined condition is satisfied during the execution of the supercharging pressure F / B control, the actual supercharging pressure is forcibly controlled to a predetermined value or more and correction processing can be performed.

  In each of Examples 6 and 7, the correction process is performed when the WGV opening correction amount is equal to or greater than a predetermined value. However, the correction process is not limited to this, and the correction is performed regardless of the magnitude of the WGV opening correction amount. Processing may be performed.

  In the first to seventh embodiments, the present invention is applied to a system using an electric actuator as a WGV drive source. However, the present invention is not limited to this. For example, an electromagnetic actuator using an electromagnetic force or a fluid pressure (for example, The present invention may be applied to a system in which a fluid pressure actuator using hydraulic pressure or air pressure) is used as a WGV drive source.

  DESCRIPTION OF SYMBOLS 11 ... Engine (internal combustion engine), 17 ... Supercharger, 18 ... Exhaust turbine, 26 ... Exhaust bypass passage (exhaust system component), 27 ... WGV, 33 ... WGV opening sensor, 36 ... Intake pressure sensor, 37 ... ECU (control means, learning means, estimation means, correction means), 39 ... electric actuator, 40 ... rod (exhaust system components)

Claims (7)

An exhaust turbine driven supercharger (17) for supercharging intake air of the internal combustion engine (11) and an exhaust bypass passage (26) for bypassing the exhaust turbine (18) of the supercharger (17) are opened and closed. A waste gate valve (hereinafter referred to as “WGV”) (27), a WGV opening sensor (33) for detecting the opening of the WGV (27), and a fully closed position of the WGV (27) as a reference position Control means (37) for executing WGV control for controlling the actuator (39) of the WGV (27) so that the actual WGV opening detected by the WGV opening sensor (33) matches the target WGV opening. In a control device for an internal combustion engine provided,
Is a state where the control value is stuck to a value to control the direction closing said WGV (27) of the within a predetermined range from the WGV (27) is the fully closed position during execution of the WGV control actuator (39) Learning to learn the reference position when it is determined that the control value of the actuator (39) is stuck to a value that controls the WGV (27) in the closing direction. An internal combustion engine control device comprising means (37). An exhaust turbine driven supercharger (17) for supercharging intake air of the internal combustion engine (11) and an exhaust bypass passage (26) for bypassing the exhaust turbine (18) of the supercharger (17) are opened and closed. A waste gate valve (hereinafter referred to as “WGV”) (27), a WGV opening sensor (33) for detecting the opening of the WGV (27), and a fully closed position of the WGV (27) as a reference position Control means (37) for executing WGV control for controlling the actuator (39) of the WGV (27) so that the actual WGV opening detected by the WGV opening sensor (33) matches the target WGV opening. In a control device for an internal combustion engine provided,
Estimating means (37) for estimating the amount of fluctuation of the fully closed position based on the amount of heat received and the amount of heat released from the exhaust system components (26, 40) of the internal combustion engine (11);
It is determined whether or not the variation amount of the fully closed position is greater than or equal to a predetermined value. If it is determined that the variation amount of the fully closed position is greater than or equal to a predetermined value, the WGV (27) is And a learning means (37) for controlling the actuator (39) so as to abut the position and learning the reference position during the abutting control. . The estimation means (37) calculates the temperature of the exhaust system component (26, 40) based on the amount of heat received and the amount of heat released from the exhaust system component (26, 40), and the exhaust system component (26). The control device for an internal combustion engine according to claim 2, wherein the fluctuation amount of the fully closed position is estimated based on the temperature of (40). An exhaust turbine driven supercharger (17) for supercharging intake air of the internal combustion engine (11) and an exhaust bypass passage (26) for bypassing the exhaust turbine (18) of the supercharger (17) are opened and closed. Waste gate valve (hereinafter referred to as “WGV”) (27), WGV opening sensor (33) for detecting the opening of the WGV (27), and intake pressure sensor for detecting the supercharging pressure of the intake air (36) and the actuator of the WGV (27) so that the actual WGV opening detected by the WGV opening sensor (33) matches the target WGV opening with the fully closed position of the WGV (27) as a reference position. The WGV control for controlling (39) is executed, and the opening correction amount of the WGV (27) is calculated so that the actual boost pressure detected by the intake pressure sensor (36) matches the target boost pressure. Supply pressure The controller of an internal combustion engine and a control means for executing a readback control (37),
During execution of the supercharging pressure feedback control, it is determined whether or not the actual supercharging pressure is equal to or higher than a predetermined value, and when it is determined that the actual supercharging pressure is equal to or higher than the predetermined value, the WGV An internal combustion engine control device comprising correction means (37) for performing correction processing for learning the reference position based on the opening correction amount of (27) or correcting the control amount of the WGV control. . The correcting means (37) sets the target supercharging pressure to the predetermined value or more when the predetermined condition is satisfied during execution of the supercharging pressure feedback control, and sets the actual supercharging pressure to the predetermined value or more. 5. The control device for an internal combustion engine according to claim 4 , wherein the control device is controlled. The correction means (37) determines whether or not the opening correction amount of the WGV (27) is a predetermined value or more, and is determined that the opening correction amount of the WGV (27) is a predetermined value or more. 6. The control apparatus for an internal combustion engine according to claim 4 or 5 , wherein the correction process is performed when the engine is running. The internal combustion engine according to any one of claims 4 to 6 , wherein the correction means (37) reflects all or part of the opening correction amount of the WGV (27) in the correction processing. Control device.

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