JP2010014053A - Intake air regulating valve control device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake air regulating valve control device for an internal combustion engine capable of accurately driving an intake air regulating valve. <P>SOLUTION: An electronic control device 40 forcibly drives a valve element 23 until the displacement of the valve element 23 is regulated by a full close stopper 27 regulating the displacement of the valve element 23 of the throttle valve 21 at a full closed position thereof, and learns a voltage VT outputted from a position sensor 45 as a voltage VTCL in a time when the valve element 23 is in a full closed position in a state that the displacement of the valve element 23 is regulated by the full close stopper 27. The electronic control device also estimates the opening TA of a throttle valve 21 based on the full closed position voltage VTCL. When prescribed conditions for maintaining a target opening TAtrg of the throttle valve 21 which is set based on an engine operation state during engine operation at a full close opening TACL are satisfied, the valve element 23 is forcibly driven to the valve closing side, and the full closed position is learned by the displacement of the valve element 23 regulated by the full closed stopper 27. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an intake metering valve control device for an internal combustion engine.

2. Description of the Related Art Conventionally, as an intake metering valve control device for an internal combustion engine of this type, for example, the one described in Patent Document 1 is known. In the conventional intake metering valve control device including the one described in Patent Document 1, an opening sensor that outputs a predetermined electrical signal such as a voltage according to a change in the opening of the valve body of the intake metering valve is provided. The opening of the intake metering valve is estimated based on the signal output from the opening sensor and the electrical signal output from the opening sensor when the valve body is in the fully closed position. Yes. The valve body is driven and controlled so that the estimated opening degree matches the target opening degree set based on the engine operating state. In such a configuration, since the electrical signal when the valve body is in the fully closed position changes due to the change over time of the intake metering valve, the fully closed position learning is performed as follows. . In other words, the valve body is forcibly driven until the displacement of the valve body is regulated by a stopper that regulates the displacement of the valve body at its fully closed position when the engine is stopped before the engine is started or after the engine operation is stopped. To do. Then, an electrical signal output from the opening sensor in a state where the displacement of the valve body is regulated by the stopper is learned as a fully closed position signal when the valve body is in the fully closed position. In the next engine operation, the intake metering valve is driven and controlled based on the fully closed position signal learned in this way.
JP 2005-155351 A

  By the way, the electrical signal from the opening sensor changes depending on the environmental temperature where the opening sensor is placed. Further, since the engine temperature differs greatly between when the engine is stopped and when the engine is operating, the temperature of the opening sensor is not constant and always varies depending on the engine temperature. For this reason, even if the fully closed position learning is performed when the engine is stopped, the temperature of the opening sensor during engine operation is different from that when the fully closed position learning is performed when the engine is stopped. It does not accurately indicate the fully closed position of the intake metering valve at the time. As a result, the accuracy of the fully closed position learning is inevitably lowered, and there is a limit to driving the intake metering valve with high accuracy during engine operation.

  Although it is conceivable to perform the fully closed position learning during engine operation for such a problem, there is a possibility that the engine operation state deteriorates due to the forced drive of the valve body of the intake metering valve. .

  In addition, such a problem is not limited to the fully closed position learning as described above. The valve body is forcibly forced until the displacement of the valve body is regulated by a stopper that regulates the displacement of the valve body at the fully opened position. Fully open position learning that drives and learns the electrical signal output from the opening sensor while the displacement of the valve body is regulated by the stopper as the fully open position signal when the valve body is in the fully open position It can occur in the same way.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an intake air metering valve control device for an internal combustion engine that can accurately drive an air intake metering valve.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
(1) The invention according to claim 1 is an intake metering valve that is provided in an intake passage of an internal combustion engine and adjusts an intake air amount supplied to a combustion chamber, and an opening change of a valve body of the intake metering valve. An opening change detecting means for outputting an electrical signal according to the position, a fully closed position restricting portion for restricting the displacement of the valve body at its fully closed position, and the displacement of the valve body being restricted by the fully closed position restricting portion. The valve body forcibly drives the valve body until the valve is closed, and the valve body outputs an electrical signal output from the opening degree change detection means in a state where the displacement of the valve body is regulated by the fully closed position regulating portion. A closed position learning means for learning as an electrical signal when in the fully closed position, and estimating the opening of the intake metering valve based on the learned electrical signal when in the fully closed position In the intake air metering valve control device, the fully closed position learning means is an engine during engine operation. The valve body is closed when a predetermined condition is established in which the degree of deviation between the target opening and the fully closed opening of the intake metering valve set based on the rotation state is maintained below a predetermined degree. The gist of the present invention is to forcibly drive the valve body and restrict the displacement of the valve body by the fully closed position restricting portion to execute learning of the fully closed position.

  According to this configuration, the fully closed position learning of the intake metering valve is performed through the fully closed position learning means during engine operation. As a result, it is possible to prevent the accuracy of the fully closed position learning from being reduced due to the engine temperature at the time of learning being lower than the engine temperature at which the intake metering valve is driven and controlled. The forced drive of the valve body during engine operation is performed when the degree of deviation between the target opening degree and the fully closed opening degree of the intake metering valve set based on the engine operation state is maintained below a predetermined degree. Therefore, the deterioration of the engine operating state due to the execution of the forced drive can be suppressed. Therefore, the intake metering valve can be driven with high accuracy.

  (2) The invention according to claim 2 is the intake metering valve control device for an internal combustion engine according to claim 1, wherein the fully closed position learning means is configured such that the target opening of the intake metering valve is fully closed. When the predetermined condition maintained every time is satisfied, the valve body is forcibly driven to the valve closing side, and the displacement of the valve body is restricted by the fully closed position restricting portion to learn the fully closed position. The gist is to do it.

  According to the same configuration, the forced drive of the valve body during engine operation is performed when the target opening degree of the intake metering valve set based on the engine operation state is maintained at the fully closed opening degree. The deterioration of the engine operating state due to the execution of the forced drive can be almost ignored.

  (3) The invention according to claim 3 is a fully open position restricting portion for restricting displacement of the valve body at its fully open position in the intake air metering valve control device for an internal combustion engine according to claim 1 or claim 2. And the opening degree in a state where the valve body is forcibly driven until the displacement of the valve body is restricted by the fully open position restricting portion and the displacement of the valve body is restricted by the fully open position restricting portion. A fully open position learning means for learning an electrical signal output from the change detecting means as an electrical signal when the valve element is in the fully open position, and adjusting the intake air with reference to the electrical signal when the valve body is in the fully opened position. The fully open position learning means establishes a predetermined condition in which a deviation degree between the target opening of the intake metering valve and the fully open position is maintained below a predetermined degree. When the valve body is forced to open And as its gist to perform the learning of the fully opened position to regulate the displacement of the dynamic and Doben body by the full-open position regulating portion.

  According to this configuration, the fully open position learning of the intake metering valve is performed during engine operation through the fully open position learning means. As a result, it is possible to suppress a decrease in the accuracy of the fully open position learning due to the engine temperature at the time of learning being lower than the engine temperature when the intake metering valve is driven and controlled. The forced drive of the valve body during engine operation is performed when the degree of divergence between the target opening of the intake metering valve set based on the engine operation state and the fully opened opening is maintained below a predetermined degree. Therefore, it is possible to suppress the deterioration of the engine operating state due to the execution of the forced driving. Therefore, the intake metering valve can be driven with high accuracy. Furthermore, since both the fully closed position learning and the fully open position learning can be performed accurately, the opening degree of the intake metering valve is estimated on the basis of the learned electrical signal at the fully closed position and the fully open position. By doing so, the estimation accuracy of the opening degree of the intake metering valve can be improved, and the intake metering valve can be driven more accurately.

  (4) The invention according to claim 4 is the intake metering valve control device for an internal combustion engine according to claim 3, wherein the fully open position learning means sets the target opening of the intake metering valve to the fully open position. When a predetermined condition to be maintained is satisfied, the valve body is forcibly driven to the valve opening side, and the displacement of the valve body is restricted by the full opening position restricting portion to perform learning of the full opening position. This is the gist.

  According to this configuration, the forced drive of the valve body during engine operation is performed when the target opening degree of the intake metering valve set based on the engine operation state is maintained at the fully open position. The deterioration of the engine operating state due to the forced driving can be almost ignored.

  (5) In the invention according to any one of claims 2 to 4, as in the invention according to claim 5, the fully closed position learning means supplies fuel to the combustion chamber of the internal combustion engine. When the condition for stopping is satisfied, the valve body is forcibly driven to the valve closing side, and the displacement of the valve body is regulated by the full-closed position restricting unit to learn the fully closed position. Can be embodied.

  Normally, when the condition for stopping the fuel supply to the combustion chamber of the internal combustion engine is established, the target opening degree of the intake metering valve is maintained at the fully closed opening degree. Therefore, according to the above configuration, the execution condition of the control by the fully closed position learning means can be set accurately.

  (6) According to the invention described in any one of claims 3 to 5, according to the invention described in claim 6, when the engine load is equal to or greater than a predetermined value, the fully open position learning means The embodiment can be embodied in such a manner that the valve body is forcibly driven to the valve opening side, and the displacement of the valve body is restricted by the full opening position restricting unit to learn the full opening position. Normally, when the engine load is a high load that is equal to or higher than a predetermined value, the target opening of the intake metering valve is maintained at an opening at which the degree of deviation from the fully opened opening is equal to or less than the predetermined degree. Therefore, according to the above configuration, the execution condition of the control by the fully open position learning means can be set accurately.

  (7) According to the invention described in any one of claims 3 to 6, according to the invention described in claim 7, the internal combustion engine is a diesel engine, and the fully-open position learning unit is configured to detect the engine temperature. When the temperature is equal to or lower than a predetermined temperature, the valve body is forcibly driven to the valve opening side, and the valve body displacement is regulated by the full opening position regulating portion, and learning of the full opening position is executed. can do. In a diesel engine, normally, at a low temperature where the engine temperature is equal to or lower than a predetermined temperature, the target opening degree of the intake metering valve is maintained at an opening degree at which the degree of deviation from the full opening degree is equal to or lower than the predetermined degree. . Therefore, according to the said structure, the execution condition of control by a full open position learning means can be set exactly.

  (8) The invention according to claim 8 is an intake metering valve that is provided in the intake passage of the internal combustion engine and adjusts the amount of intake air supplied to the combustion chamber, and the opening change of the valve body of the intake metering valve Until the displacement of the valve body is regulated by the fully open position regulating unit, the opening degree regulating unit for regulating the displacement of the valve body at its fully opened position, and the fully opened position regulating unit. The valve body is in the fully open position when the valve body is forcibly driven and the displacement of the valve body is restricted by the fully open position restricting portion. An intake metering valve control device for an internal combustion engine that includes a fully-open position learning means that learns as an electrical signal at the time, and that estimates the opening of the intake metering valve with reference to the electrical signal at the fully-opened learned position , The fully open position learning means When the predetermined condition is established that the degree of deviation between the target opening degree and the fully opening degree of the intake metering valve set based on the rotation state is maintained below the predetermined degree, the valve body is moved to the valve opening side. The gist of the invention is to forcibly drive the valve body and restrict the displacement of the valve body by the fully open position restricting portion to execute learning of the fully open position.

  According to this configuration, the fully open position learning of the intake metering valve is performed during engine operation through the fully open position learning means. As a result, it is possible to suppress a decrease in the accuracy of the fully open position learning due to the engine temperature at the time of learning being lower than the engine temperature when the intake metering valve is driven and controlled. The forced drive of the valve body during engine operation is performed when the degree of divergence between the target opening of the intake metering valve set based on the engine operation state and the fully opened opening is maintained below a predetermined degree. Therefore, it is possible to suppress the deterioration of the engine operating state due to the execution of the forced driving. Therefore, the intake metering valve can be driven with high accuracy.

  1 to 5, an embodiment of an intake metering valve control device for an internal combustion engine according to the present invention is embodied as a throttle valve control device for an in-vehicle diesel engine (hereinafter, “engine 10”). Will be described in detail.

FIG. 1 schematically shows a schematic configuration of the engine 10 and an electronic control unit 40 that controls the engine 10.
The engine 10 includes an intake passage 11, a combustion chamber 12, and an exhaust passage 13. The intake passage 11 is provided with a throttle unit 20 including a throttle valve 21 for metering intake air. Further, the engine 10 is provided with a fuel injection valve 14 for directly injecting fuel into the combustion chamber 12. Then, the air that is metered by the throttle valve 21 and supplied to the combustion chamber 12 and the fuel injected from the fuel injection valve 14 are mixed, and the mixture thus mixed is combusted in the combustion chamber 12. As a result, the output of the engine 10 is generated. Further, the exhaust generated by the combustion is discharged to the exhaust passage 13.

Here, the configuration of the throttle unit 20 will be described with reference to FIG. FIG. 2 schematically shows a schematic configuration of the throttle unit 20.
The intake passage 11 is provided with a housing 22 that forms a part of the passage 11 and encloses a throttle valve 21. The throttle valve 21 includes a valve body 23 and a rotation shaft 24 that is the rotation center of the valve body 23. Further, a valve lever 25 that rotates integrally with the rotation shaft 24 is connected to one end side (right end side in the drawing) of the rotation shaft 24. Hereinafter, of the rotating directions of the rotating shaft 24, the direction in which the throttle valve 21 opens is referred to as the valve opening direction, and the direction in which the throttle valve 21 is closed is referred to as the valve opening direction.

  The throttle unit 20 includes a fully open stopper 26 that restricts rotation of the valve lever 25 in the valve opening direction and a fully closed stopper 27 that restricts rotation of the valve lever 25 in the valve closing direction. When the valve lever 25 rotates in the valve opening direction and hits the fully open stopper 26, the position of the valve body 23 at that time in the rotation direction becomes the fully open position. Further, when the valve lever 25 rotates in the valve closing direction and abuts against the fully closed stopper 27, the position of the valve body 23 at that time in the rotation direction becomes the fully closed position. The fully open stopper 26 restricts the displacement of the valve body 23 at its fully open position, and corresponds to a fully open position restricting portion according to the present invention. The fully closed stopper 27 restricts the displacement of the valve body 23 at the fully closed position, and corresponds to a fully closed position restricting portion according to the present invention.

  The throttle unit 20 includes an electric motor 28, and a speed reduction mechanism 29 is provided between the output shaft of the motor 28 and the valve lever 25. Thereby, the rotational force of the electric motor 28 is transmitted to the valve lever 25 via the speed reduction mechanism 29. When the valve lever 25 is rotated, the rotation shaft 24 is rotated and the valve body 23 is opened and closed. The rotating shaft 24 of the throttle valve 21 is biased in the valve closing direction by a spring.

  As shown in FIG. 1, the engine 10 is provided with various sensors for detecting the operating state. That is, an accelerator opening sensor 41 that detects an operation amount of the pedal (hereinafter referred to as “accelerator opening ACCP”) is provided in the vicinity of the accelerator pedal. Further, an engine speed sensor 42 that detects the engine speed NE from the rotation of the shaft is provided in the vicinity of the crankshaft of the engine 10. A water jacket for circulating the cooling water of the engine 10 is provided with a water temperature sensor 43 for detecting the temperature of the cooling water (hereinafter referred to as “cooling water temperature THW”). An intake air amount sensor 44 for detecting the amount of intake air supplied to the combustion chamber 12 is provided upstream of the throttle valve 21 in the intake passage 11. As shown in FIG. 2, a position sensor 45 that outputs a voltage VT corresponding to the position of the valve body 23 in the rotation direction is provided at the other end side (left end side in the drawing) of the rotation shaft 24 of the throttle valve 21. Is provided. Detection signals from these sensors 41 to 45 are input to an electronic control unit 40 that executes various controls of the engine 10. The position sensor 45 outputs a voltage VT corresponding to a change in the opening degree of the valve body 23 of the throttle valve 21, and corresponds to an opening degree change detecting means according to the present invention.

  The electronic control unit 40 includes a program for executing various controls, a calculation map, and a memory that stores various data calculated when the control is executed. The electronic control unit 40 includes the sensors 41 to 45 described above. For example, the following controls are executed based on the engine operating state and the like ascertained from the output values of the various sensors. That is, fuel injection control for controlling the fuel injection valve 14, opening degree estimation control for estimating the opening degree of the throttle valve 21, and throttle control for controlling the throttle valve 21 are executed.

In the fuel injection control, the target injection amount Qtrg is set based on the accelerator opening ACCP and the like, and the fuel injection valve 14 is opened according to the target injection amount Qtrg.
In the opening degree estimation control, when a predetermined execution condition is satisfied, the valve element 23 is forcibly driven until the displacement of the valve element 23 is restricted by the full opening stopper 26, and the valve element is driven by the full opening stopper 26. The voltage VT output from the position sensor 45 in a state where the displacement of the valve 23 is regulated is learned as the fully open position voltage VTOP when the valve body 23 is in the fully open position. Further, when a predetermined execution condition is satisfied, the valve body 23 is forcibly driven until the displacement of the valve body 23 is restricted by the fully closed stopper 27, and the displacement of the valve body 23 is caused by the fully closed stopper 27. Fully closed position learning control is performed in which the voltage VT output from the position sensor 45 in the restricted state is learned as the fully closed position voltage VTCL when the valve body 23 is in the fully closed position. Then, the opening degree TA of the throttle valve 21 is estimated based on the learned fully opened position voltage VTOP and fully closed position voltage VTCL. Specifically, since the position sensor 45 outputs a voltage VT proportional to the opening degree TA of the throttle valve 21, the voltage difference between the fully open position voltage VTOP and the fully closed position voltage VTCL (= VTOP−VTCL). Is divided by the opening difference between the fully opened opening TAOP and the fully closed opening TACL (= TAOP−TACL) to obtain a voltage difference ΔVT per unit opening change. Then, the value obtained by subtracting the fully closed position voltage VTCL from the voltage VT output from the position sensor 45 (= VT−VTCL) by the voltage difference ΔVT is the opening degree TA of the throttle valve 21 at that time. Estimate as

  In the throttle control, the target opening degree TAtrg of the throttle valve 21 is set based on the engine operating state, and the electric motor 28 is controlled so that the estimated opening degree TA of the throttle valve 21 coincides with the target opening degree TAtrg. To do. Specifically, the target opening degree TAtrg is set to the full opening degree TAOP at the time of high load operation where the engine load KL is equal to or higher than a predetermined value K1 or during cold operation where the coolant temperature THW is equal to or lower than the predetermined temperature T1. Further, when a condition for stopping fuel supply to the combustion chamber 12 during engine operation, that is, a so-called fuel cut control execution condition is satisfied, the target opening degree TAtrg is set to the fully closed opening degree TACL. Here, execution conditions of the fuel cut control can be satisfied such that the accelerator opening ACCP is a fully closed opening and the engine rotational speed NE is equal to or higher than a predetermined rotational speed NE1. In the present embodiment, the engine load KL is grasped based on the target injection amount Qtrg.

By the way, the voltage VT output from the position sensor 45 varies depending on the environmental temperature where the position sensor 45 is placed.
FIG. 3 shows the relationship between the actual opening degree TAR of the throttle valve 21 and the output voltage VT of the position sensor 45. In the figure, the transition of the output voltage VT when the environmental temperature where the position sensor 45 is placed is high is indicated by a solid line, and the transition of the output voltage VT when the environmental temperature where the position sensor 45 is placed is low. Is shown.

  In the position sensor 45 of the present embodiment, the output voltage VT of the position sensor 45 is higher when the environmental temperature where the sensor 45 is placed is high than when it is low. For this reason, for example, when the throttle valve 21 is at the fully closed opening (TARCL), the voltage VTCL1 is output from the position sensor 45 when the environmental temperature in which the position sensor 45 is placed is high. When the environmental temperature is low, a voltage VTCL2 (<VTCL1) lower than the voltage VTCL1 is output. Further, for example, when the throttle valve 21 is at the fully open position (TAROP), the voltage VTOP1 is output from the position sensor 45 when the environmental temperature in which the position sensor 45 is placed is high, whereas the environmental temperature is the same. Is low, a voltage VTOP2 (<VTOP1) lower than the same voltage VTOP1 is output.

  Further, since the engine temperature differs greatly between when the engine is stopped and when the engine is operating, the temperature of the position sensor 45 is not constant and always varies depending on the engine temperature. For this reason, even if the fully closed position learning and the fully open position learning are performed when the engine is stopped, the temperature of the position sensor 45 during engine operation is different from the time when the fully closed position learning and fully open position learning are performed when the engine is stopped. Therefore, the learning result does not accurately indicate the fully closed position and fully opened position of the throttle valve 21 during engine operation. As a result, the accuracy of fully closed position learning and fully open position learning is inevitably lowered, and there is a limit to driving the throttle valve 21 with high accuracy during engine operation.

  Therefore, in the present embodiment, the valve body 23 is forcibly moved to the valve closing side when a predetermined condition for maintaining the target opening degree TAtrg of the throttle valve 21 at the fully closed opening degree TACL is satisfied through the electronic control unit 40. And the displacement of the valve body 23 is regulated by a fully closed stopper 27 to learn the fully closed position. Further, when a predetermined condition is established that the target opening degree TAtrg of the throttle valve 21 is maintained at the full opening degree TAOP, the valve body 23 is forcibly driven to the valve opening side so that the displacement of the valve body 23 is reduced to the full opening stopper. 26, the learning of the fully open position is executed. Thus, it is possible to suppress a decrease in the accuracy of the fully closed position learning and the fully opened position learning due to the engine temperature at the time of learning being lower than the engine temperature when the throttle valve 21 is driven and controlled. ing.

  Next, the fully closed position learning control will be described in detail with reference to FIG. FIG. 4 is a flowchart showing a processing procedure of the fully closed position learning control. A series of processing shown in this flowchart is repeatedly executed by the device 40 while the electronic control device 40 is energized.

  In this process, first, it is determined whether or not the engine is operating (step S101). Here, when the engine is operating (step S101: “YES”), it is next determined whether or not an execution condition for fuel cut control is satisfied (step S102). As a result, if the execution condition for fuel cut control is satisfied (step S102: “YES”), it is assumed that the execution condition for fully closed position learning is satisfied, and then the valve of the throttle valve 21 is set. The body 23 is forcibly driven in the fully closed direction and abuts against the fully closed stopper 27 (step S103). Then, the output voltage VT at that time of the position sensor 45 is learned as the fully closed position voltage VTCL (step S104), and this series of processing is once ended.

  On the other hand, when the engine is not in operation (step S101: “NO”) or when the fuel cut control execution condition is not satisfied (step S102: “NO”), the fully closed position learning execution condition is satisfied. As a result, the series of processes is temporarily terminated.

  Next, full open position learning control will be described in detail with reference to FIG. FIG. 5 is a flowchart showing the processing procedure of the fully open position learning control. A series of processing shown in this flowchart is repeatedly executed by the device 40 while the electronic control device 40 is energized.

  In this process, first, it is determined whether or not the engine is operating (step S201). If the engine is operating (step S201: “YES”), it is next determined whether or not the coolant temperature THW is equal to or lower than a predetermined temperature T1 (step S202). Here, when the coolant temperature THW is equal to or lower than the predetermined temperature T1 (step S202: “YES”), it is assumed that the execution condition for the fully open position learning is satisfied, and the process proceeds to step S204. To do.

  On the other hand, if the coolant temperature THW is not equal to or lower than the predetermined temperature T1 (step S202: “NO”), it is next determined whether or not the engine load KL is equal to or higher than a predetermined value K1 (step S203). Here, when the engine load KL is equal to or greater than the predetermined value K1 (step S203: “YES”), it is assumed that the execution condition for the fully open position learning is satisfied, and the process proceeds to step S204. To do.

  In the process of step S204, the valve element 23 of the throttle valve 21 is forcibly driven in the fully open direction and abuts against the fully open stopper 26 (step S204). Then, the output voltage VT at that time of the position sensor 45 is learned as the fully open position voltage VTOP (step S205), and this series of processing is once ended.

  On the other hand, when the engine is not operating (step S201: “NO”), the cooling water temperature THW is not lower than the predetermined temperature T1 (step S202: “NO”), and the engine load KL is not higher than the predetermined value K1. In (step S203: “NO”), it is assumed that the execution condition for the fully open position learning is not satisfied, and this series of processes is temporarily ended.

According to the intake air metering valve control apparatus for an internal combustion engine according to the present embodiment described above, the following operational effects can be obtained.
(1) When a predetermined condition for maintaining the target opening degree TAtrg of the throttle valve 21 at the fully closed opening degree TACL is established through the electronic control unit 40, the valve body 23 is forcibly driven to the valve closing side and The displacement of the valve body 23 is restricted by the fully closed stopper 27 and learning of the fully closed position is executed. As described above, when the fully closed position learning of the throttle valve 21 is performed during engine operation, the engine temperature at the time of learning becomes lower than the engine temperature when the throttle valve 21 is driven and controlled. It can suppress that the precision of closed position learning falls. Further, the forced drive of the valve body 23 during engine operation is performed when the target opening degree TAtrg of the throttle valve 21 set based on the engine operating state is maintained at the fully closed opening degree TACL. The deterioration of the engine operating state due to the execution of driving can be almost ignored. Therefore, the throttle valve 21 can be driven with high accuracy.

  (2) When a predetermined condition is established that the target opening degree TAtrg of the throttle valve 21 is maintained at the full opening degree TAOP through the electronic control unit 40, the valve body 23 is forcibly driven to the valve opening side to The displacement of the body 23 is restricted by the fully open stopper 26 and learning of the fully open position is executed. As described above, when the fully open position learning of the throttle valve 21 is performed during engine operation, the engine temperature at the time of learning becomes lower than the engine temperature when the throttle valve 21 is driven and controlled. It can suppress that the precision of learning falls. Further, the forced drive of the valve body 23 during engine operation is performed when the target opening degree TAtrg of the throttle valve 21 set based on the engine operating state is maintained at the fully opened opening degree TAOP. The deterioration of the engine operating condition due to the execution of can almost be ignored. Therefore, the throttle valve 21 can be driven with high accuracy. Further, since both the fully closed position learning and the fully opened position learning can be performed with high accuracy, the throttle valve is based on the output voltages VTCL and VTOP of the position sensor 45 when the fully closed position and the fully opened position are learned. By estimating the opening degree of the valve 21, it is possible to improve the estimation accuracy of the opening degree of the throttle valve 21 and to drive the throttle valve 21 with higher accuracy.

  (3) When the condition for stopping the fuel supply to the combustion chamber 12 of the engine 10 is established through the electronic control unit 40, the valve body 23 is forcibly driven to the valve closing side to completely displace the valve body 23. The learning by the closed stopper 27 is performed to learn the fully closed position. When the condition for stopping the fuel supply to the combustion chamber 12 of the engine 10 is established, the target opening degree TAtrg of the throttle valve 21 is maintained at the fully closed opening degree TACL. Therefore, according to the above-described embodiment, the execution conditions for the fully closed position learning control can be accurately set.

  (4) When the engine load KL is greater than or equal to the predetermined value K1 through the electronic control unit 40, the valve element 23 is forcibly driven to the valve opening side, and the displacement of the valve element 23 is regulated by the full opening stopper 26 to be fully opened. It was decided to perform position learning. At a high load when the engine load KL is equal to or greater than the predetermined value K1, the target opening degree TAtrg of the throttle valve 21 is maintained at the fully opened opening degree TAOP. Therefore, according to the above-described embodiment, the execution condition of the fully open position learning control can be accurately set.

  (5) The engine 10 is a diesel engine, and when the cooling water temperature THW is equal to or lower than the predetermined temperature T1 through the electronic control unit 40, the valve body 23 is forcibly driven to the valve opening side to displace the valve body 23. It is decided to perform learning of the fully open position by being restricted by the fully open stopper 26. In the diesel engine 10, the target opening degree TAtrg of the throttle valve 21 is maintained at the fully opened opening degree TAOP at a low temperature when the coolant temperature THW is equal to or lower than the predetermined temperature T1. Therefore, according to the above embodiment, the execution condition of the fully open position learning control can be set accurately.

  Note that the intake air metering valve control device for an internal combustion engine according to the present invention is not limited to the configuration exemplified in the above embodiment, and can be implemented as, for example, the following form appropriately modified. .

  In the above-described embodiment, the position sensor 45 that outputs a higher voltage VT than when it is low when the environmental temperature in which the position sensor 45 is placed is exemplified. However, instead of this, the ambient temperature in which the sensor is placed is It is also possible to use a position sensor that outputs a lower voltage VT when it is higher than when it is lower.

  In the above embodiment, the fully closed position learning control is always executed when the execution condition of the fully closed position learning control is satisfied during engine operation.For example, when the fully closed position learning control is completed once. The fully closed position learning control may not be executed during the engine operation. In this case, it is possible to suppress an unnecessary increase in the execution frequency of the fully closed position learning control. Further, the fully closed position learning control can be executed only when the engine temperature changes by a predetermined degree or more. In this case, the fully closed position learning control can be executed only when the engine temperature has changed greatly, that is, only when it is highly necessary to execute the fully closed position learning control. Execution conditions can be set more accurately. Moreover, these modifications can be similarly applied to the fully open position learning control.

  In the above embodiment, the configuration in which the fully closed position learning control and the fully open position learning control are executed during engine operation is exemplified, but in addition, at least one of the fully closed position learning and the fully open position learning is executed when the engine is stopped. You may make it do.

  As described in the above embodiment, performing both the fully closed position learning control and the fully open position learning control improves the estimation accuracy of the opening degree of the throttle valve 21 and makes the throttle valve 21 more accurate. Desirable for driving. However, the present invention is not limited to this, and the throttle valve 21 is driven with a certain degree of accuracy even in a configuration in which only the fully closed position learning control is performed or a configuration in which only the fully opened position learning control is performed. Will be able to.

  In the above embodiment, the configuration for executing the fully closed position learning control when the execution condition for the fuel cut control is satisfied is illustrated, but the execution condition for the fully closed position learning control is not limited to this. As long as the target opening degree TAtrg of the throttle valve 21 is maintained at the fully closed opening degree TACL, the fully closed position learning control may be executed when other conditions are satisfied.

  In the above embodiment, the configuration is shown in which the fully open position learning control is executed when the coolant temperature THW is equal to or lower than the predetermined temperature T1 or when the engine load KL is equal to or higher than the predetermined value K1. The execution condition of the control is not limited to this, and if the target opening degree TAtrg of the throttle valve 21 is maintained at the full opening degree TAOP, the full opening position learning control is executed when other conditions are satisfied. You may do it.

  In the above embodiment, the fully closed position learning control is executed when a predetermined condition is established that the target opening degree TAtrg of the throttle valve 21 set based on the engine operating state is maintained at the fully closed opening degree TACL. However, the execution condition of the fully closed position learning control is not limited to this. In addition, for example, the fully closed position learning control may be executed even when the target opening is maintained at an opening slightly larger than the fully closed opening. In short, what is necessary is just to perform the fully closed position learning when a predetermined condition is established in which the degree of deviation between the target opening and the fully closed opening is maintained below the predetermined degree.

  In the above embodiment, the fully open position learning control is executed when a predetermined condition is established that the target opening degree TAtrg of the throttle valve 21 set based on the engine operating state is maintained at the fully opened opening degree TAOP. However, the execution condition of the fully open position learning control is not limited to this. That is, the fully open position learning control may be executed even when the target opening is maintained at an opening slightly smaller than the fully opened opening. In short, it is sufficient if the fully open position learning is executed when a predetermined condition is established in which the degree of divergence between the target opening and the fully opened opening is maintained below the predetermined degree.

  In the above embodiment, the present invention is applied to the diesel engine 10, but the internal combustion engine according to the present invention is not limited to the diesel engine, and the present invention is also applicable to a gasoline engine. it can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram schematically showing a schematic configuration of an engine and an electronic control unit that controls the intake control valve control device for an internal combustion engine according to an embodiment of the present invention. The schematic diagram which shows typically schematic structure of the throttle unit of the embodiment. The graph which shows the relationship between the actual opening degree of the throttle valve of the embodiment, and the output voltage of a position sensor. The flowchart which shows the process sequence of the fully closed position learning control of the embodiment. The flowchart which shows the process sequence of the full open position learning control of the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Engine, 11 ... Intake passage, 12 ... Combustion chamber, 13 ... Exhaust passage, 14 ... Fuel injection valve, 20 ... Throttle unit, 21 ... Throttle valve (intake metering valve), 22 ... Housing, 23 ... Valve body , 24 ... Rotating shaft, 25 ... Valve lever, 26 ... Full open stopper (fully open position restricting portion), 27 ... Full close stopper (fully closed position restricting portion), 28 ... Electric motor, 29 ... Deceleration mechanism, 40 ... Electronic control Device (fully closed position learning means, fully open position learning means), 41 ... accelerator opening sensor, 42 ... engine speed sensor, 43 ... water temperature sensor, 44 ... intake air amount sensor, 45 ... position sensor (opening change detecting means) .

Claims (8)

An intake metering valve that is provided in the intake passage of the internal combustion engine and adjusts the amount of intake air supplied to the combustion chamber, and an opening change detection that outputs an electrical signal corresponding to the opening change of the valve body of the intake metering valve Means, a fully closed position restricting portion for restricting displacement of the valve body at its fully closed position, and forcibly driving the valve body until displacement of the valve body is restricted by the fully closed position restricting portion. In addition, the electrical signal output from the opening change detecting means in a state where the displacement of the valve body is regulated by the fully closed position regulating unit is learned as an electrical signal when the valve body is in the fully closed position. An intake metering valve control device for an internal combustion engine that includes a fully closed position learning means and estimates the opening of the intake metering valve with reference to an electrical signal when the fully closed position is learned.
The fully closed position learning means has a predetermined condition in which a deviation degree between a target opening degree of the intake metering valve and a fully closed opening degree that is set based on an engine operation state during engine operation is maintained below a predetermined degree. An internal combustion engine characterized in that, when established, the valve body is forcibly driven to the valve closing side, and the displacement of the valve body is restricted by the fully closed position restricting unit to learn the fully closed position. Intake metering valve control device. The intake metering valve control device for an internal combustion engine according to claim 1,
The fully closed position learning means forcibly drives the valve body to the closed side when a predetermined condition for maintaining the target opening of the intake air metering valve at the fully closed opening is satisfied. An intake metering valve control device for an internal combustion engine, wherein body displacement is regulated by the full-closed position regulating unit and learning of the full-closed position is executed. The intake air metering valve control device for an internal combustion engine according to claim 1 or 2,
A fully open position restricting portion for restricting the displacement of the valve body at its fully open position; and the fully open position restricting portion for forcibly driving the valve body until the displacement of the valve body is restricted by the fully open position restricting portion. A fully open position learning means for learning an electrical signal output from the opening change detecting means in a state in which the displacement of the valve body is regulated as an electrical signal when the valve body is in the fully open position, Estimating the opening of the intake metering valve with reference to the electrical signal when in the fully opened position to be learned,
The fully open position learning means forcibly moves the valve body to the valve opening side when a predetermined condition is established in which the degree of deviation between the target opening degree of the intake metering valve and the fully open position is maintained below a predetermined degree. An intake air metering valve control device for an internal combustion engine, wherein the valve body is driven and the displacement of the valve body is restricted by the fully open position restricting portion to learn the fully open position. The intake metering valve control device for an internal combustion engine according to claim 3,
The fully open position learning means forcibly drives the valve body to the valve opening side when a predetermined condition is established that the target opening of the intake metering valve is maintained at the fully open position. An intake metering valve control device for an internal combustion engine, wherein displacement is regulated by the full-open position regulating unit and learning of the full-open position is executed. In the intake metering valve control device for an internal combustion engine according to any one of claims 2 to 4,
The fully closed position learning means forcibly drives the valve body to the closed side when the condition for stopping the fuel supply to the combustion chamber of the internal combustion engine is satisfied, and the displacement of the valve body is changed to the fully closed position. An intake metering valve control device for an internal combustion engine, characterized in that learning of the fully closed position is executed by restriction by a restriction unit. In the intake metering valve control device for an internal combustion engine according to any one of claims 3 to 5,
The fully open position learning means forcibly drives the valve body to the valve opening side when the engine load is equal to or greater than a predetermined value, and restricts the displacement of the valve body by the fully open position restricting portion. An intake air metering valve control device for an internal combustion engine, wherein learning is executed. In the intake metering valve control device for an internal combustion engine according to any one of claims 3 to 6,
The internal combustion engine is a diesel engine;
The fully open position learning means forcibly drives the valve body to the valve opening side when the engine temperature is equal to or lower than a predetermined temperature, and restricts the displacement of the valve body by the fully open position restricting portion. An intake air metering valve control device for an internal combustion engine, wherein learning is executed. An intake metering valve that is provided in the intake passage of the internal combustion engine and adjusts the amount of intake air supplied to the combustion chamber, and an opening change detection that outputs an electrical signal corresponding to the opening change of the valve body of the intake metering valve Means, a fully open position restricting portion for restricting the displacement of the valve body at its fully open position, and forcibly driving the valve body until the displacement of the valve body is restricted by the fully open position restricting portion and the fully open position. A fully open position learning means for learning an electrical signal output from the opening change detecting means in a state where the displacement of the valve body is restricted by a position restricting portion as an electrical signal when the valve body is in the fully open position; An intake air metering valve control device for an internal combustion engine that estimates the opening of the air intake metering valve with reference to the electrical signal at the fully opened position that is learned,
The fully open position learning means satisfies a predetermined condition in which a deviation degree between a target opening degree of the intake metering valve set based on an engine operating state during engine operation and a fully open position is maintained below a predetermined degree. The valve body is forcibly driven to the valve opening side and the displacement of the valve body is regulated by the full-open position restricting portion to perform learning of the full-open position. Valve control device.

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