JP4775248B2 - Valve operating device for internal combustion engine - Google Patents

Description

  The present invention relates to a valve operating apparatus for an internal combustion engine capable of changing a maximum lift amount of an engine valve.

  In recent years, in order to improve the fuel consumption and output of an internal combustion engine, a valve operating device for the internal combustion engine that changes the maximum lift amount of the engine valve based on the engine operating state has been widely adopted. As such a valve operating device, for example, one described in Patent Document 1 is known. Specifically, an intermediary drive mechanism is provided between the engine valve and the cam. The intermediary drive mechanism includes an input unit that abuts on the cam and swings based on the rotation thereof, and the input unit. And an output section that reciprocates the engine valve by swinging together. In addition, a control shaft is drivingly connected to the input portion and the output portion, and an actuator for driving the control shaft is provided at a base end portion of the control shaft. When the control shaft is driven by the actuator, the relative phase difference between the input unit and the output unit is changed, and the maximum lift amount of the engine valve is changed. In addition, such a valve operating system is provided with a sensor for detecting an engine operating state, such as an accelerator sensor or a crank angle sensor, and an electronic control unit for setting the target value of the maximum lift amount by taking in the detection values of these sensors. Yes. In addition, the valve operating device is provided with a lift amount sensor for detecting the lift amount of the engine valve. The electronic control unit detects the actual value of the maximum lift amount of the engine valve through the lift amount sensor, and controls the actuator based on the deviation between the actual value and the target value, thereby controlling the maximum value of the engine valve. The lift amount is feedback controlled.

Normally, as the lift amount detecting means, a lift amount sensor for detecting the position of the engine valve, such as a potentiometer, is used. However, the lift amount sensor detects the lift amount sensor due to mechanical and electrical variations or aging. Deviation may occur between the maximum lift amount detected value of the engine valve and the actual value. Therefore, as described in Patent Document 2, for example, a valve operating apparatus has been proposed in which the detection value of the lift amount sensor is corrected by learning the reference position output value of the lift amount sensor. That is, in this valve operating apparatus, the maximum lift amount of the engine valve is controlled to be the design maximum value or the minimum value, and at this time, the detected value of the lift amount sensor is learned as the reference position output value, and the reference position output The detection value of the lift amount sensor is corrected based on the deviation between the value and the design value. As a result, the deviation between the detected value of the maximum lift amount of the engine valve and the actual value due to variations in the lift amount sensor or the like can be suppressed.
JP 2005-69147 A JP 2003-41955 A

  In this way, the maximum lift amount of the engine valve is controlled to be the design maximum value or the minimum value, and the detection value by the lift amount sensor is learned as the reference position output value to correct the detection value of the lift amount sensor. The deviation between the detected value of the maximum lift amount of the engine valve and the actual value can be compensated. However, normally, when the maximum lift amount of the engine valve is controlled to the above design maximum value or minimum value, the electronic control unit sets a target drive amount that exceeds the design drive range of the control shaft, and the control shaft is set to the design maximum value. The driving limit position corresponding to the value or the minimum value is mechanically abutted. Then, when the control shaft stops, that is, when the detected value of the maximum lift amount of the engine valve by the lift amount sensor does not change, the above learning and correction are performed. For this reason, for example, when a failure such as the engagement of the control shaft or various mechanisms for driving the control shaft occurs, it cannot be denied that the control shaft stops in a state where the control shaft has not reached the drive limit position. If the control shaft stops without reaching the drive limit position in this way, the detection value of the lift amount sensor does not change, and the detection value of the lift amount sensor at that time is learned as the reference position output, and the lift amount sensor There is a risk that the detection value of the quantity sensor is erroneously corrected.

  The present invention has been made in view of such circumstances, and its object is to suppress erroneous correction of the detection value of the lift amount sensor due to mechanical failure such as biting. An object of the present invention is to provide a valve operating device for an internal combustion engine.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
In order to solve these problems, the invention according to claim 1 is configured to reciprocate the engine valve by abutting the cam of the internal combustion engine and swinging based on the rotation of the cam, and swinging together with the input unit. An output unit, and a control shaft that is drivingly connected to the input unit and the output unit and is capable of reciprocating between two drive limit positions along the axial direction, and driving the control shaft in the axial direction A lift mechanism for changing the maximum lift amount of the engine valve by changing a rotational phase difference between the input unit and the output unit; and a lift amount sensor for detecting the maximum lift amount of the engine valve. Maximum lift amount changing means for reciprocatingly driving the control shaft of the change mechanism so that the detected value matches the target value for the maximum lift amount of the engine valve; A detection value correction unit that learns at least one of the detection values of the lift amount sensor corresponding to the field position as a reference position output value and corrects the detection value of the lift amount sensor based on the reference position output value; In the valve operating apparatus for an internal combustion engine, including a movement amount detecting means for detecting a movement amount of the control shaft, the movement amount detecting means detects when the control shaft is driven and controlled from one of the drive limit positions to the other. When the deviation between the detected value of the movement amount of the control shaft and the distance between the two drive limit positions is larger than a predetermined value, the learning of the reference position output value by the detected value correcting means is invalidated and the lift The gist thereof is to provide a prohibiting means for prohibiting the correction of the detection value of the quantity sensor.

  According to this configuration, the deviation between the detected value of the movement amount of the control shaft detected when the control shaft is driven from one of the drive limit positions to the other and the distance between the two drive limit positions is larger than a predetermined value. In this case, although the control shaft is driven and controlled, the control shaft is not displaced by a predetermined amount. Therefore, in this case, the learning of the reference position output value by the detection value correction means is invalidated and the correction of the detection value of the lift amount sensor is prohibited, so that the control shaft and various mechanisms for driving the control shaft are engaged. It is possible to prevent the detection value of the lift amount sensor from being erroneously corrected due to a mechanical failure.

  According to a second aspect of the present invention, in the valve operating apparatus for an internal combustion engine according to the first aspect, the detection value correcting means is based on both detection values of the lift amount sensor corresponding to the two drive limit positions. Learning as a position output value, calculating a difference between a reference position output value corresponding to one of the two drive limit positions and a design value of the maximum lift amount corresponding to the same drive limit position, and the two drive limits Calculating a difference between a reference position output value corresponding to the other of the positions and a design value of the maximum lift amount corresponding to the drive limit position, and correcting a detected value of the lift amount sensor based on the two differences. Its features.

  According to this configuration, both the lift amount sensor output values corresponding to the two drive limit positions are learned as reference position output values, and the reference position output value and the design value of the maximum lift amount corresponding to the drive limit position are By correcting the detection value of the lift amount sensor based on the difference, the maximum lift amount of the engine valve can be detected more accurately.

  Hereinafter, an embodiment in which the present invention is applied to a valve operating apparatus for an internal combustion engine mounted on a vehicle will be described with reference to FIGS. Here, FIG. 1 is a sectional view showing a partial cross-sectional structure of the intake / exhaust valve operating device for the internal combustion engine according to the present embodiment, and FIG. 2 is an intake / exhaust valve operating for the internal combustion engine according to the present embodiment. It is a top view which shows the arrangement | positioning aspect of an apparatus.

  As shown in FIGS. 1 and 2, the internal combustion engine mounted on the vehicle has four cylinders, and a pair of exhaust valves 10 and intake valves 20 corresponding to the cylinders 2 are provided in the cylinder head 2. Each is provided so as to be able to reciprocate. The cylinder head 2 is provided with an exhaust valve device 90 and an intake valve device 100 corresponding to the exhaust valve 10 and the intake valve 20, respectively.

  The exhaust valve device 90 is provided with a lash adjuster 12 corresponding to each exhaust valve 10, and a rocker arm 13 is installed between the lash adjuster 12 and the exhaust valve 10. One end of the rocker arm 13 is supported by the lash adjuster 12 and the other end is in contact with the proximal end portion of the exhaust valve 10. A plurality of cams 15 are formed on the exhaust camshaft 14 rotatably supported by the cylinder head 2, and the outer peripheral surface of the cams 15 abuts on a roller 13 a provided at an intermediate portion of the rocker arm 13. Has been. The exhaust valve 10 is provided with a retainer 16, and a valve spring 11 is provided between the retainer 16 and the cylinder head 2. The exhaust valve 10 is urged in the valve closing direction by the urging force of the valve spring 11. Thereby, the roller 13 a of the rocker arm 13 is pressed against the outer peripheral surface of the cam 15. When the cam 15 rotates during engine operation, the rocker arm 13 swings with a portion supported by the lash adjuster 12 as a fulcrum. As a result, the exhaust valve 10 is driven to open and close by the rocker arm 13.

  On the other hand, the intake valve apparatus 100 is provided with a valve spring 21, a retainer 26 provided on the intake valve 20, a rocker arm 23, and a lash adjuster 22 in the same manner as the exhaust side. A plurality of cams 25 are formed on the intake camshaft 24 that is rotatably supported by the cylinder head 2. Further, unlike the exhaust valve operating device 90, the intake valve operating device 100 is provided with an intermediate drive mechanism 50 between the cam 25 and the rocker arm 23. The intermediate drive mechanism 50 has an input unit 51 and a pair of output units 52, and the input unit 51 and the output unit 52 are swingably supported by a support pipe 53 fixed to the cylinder head 2. . Here, the rocker arm 23 is urged toward the output portion 52 by the urging force of the lash adjuster 22 and the valve spring 21, and a roller 23 a provided at an intermediate portion of the rocker arm 23 is placed on the outer peripheral surface of the output portion 52. It is in contact. As a result, the input unit 51 is urged to swing in the counterclockwise direction W1 together with the output unit 52, and the roller 51a provided at the tip of the portion of the input unit 51 extending in the radial direction is urged toward the cam 25. Become so.

  In such a valve operating apparatus, when the cam 25 rotates during engine operation, the cam 25 presses the input portion 51 while slidingly contacting the roller 51 a, so that the output portion 52 swings in the circumferential direction of the support pipe 53. Become. When the output unit 52 swings, the rocker arm 23 swings with the portion supported by the lash adjuster 22 as a fulcrum. As a result, the intake valve 20 is driven to open and close by the rocker arm 23.

  Further, a projection 20a protruding in the radial direction is formed on the shaft portion of the intake valve 20, and a lift amount sensor 80 as a potentiometer is provided in the vicinity of the projection 20a. The lift amount sensor 80 is connected to an electronic control unit 70 described later, and outputs a detection signal that changes based on a change in the distance between the lift amount sensor 80 and the protrusion 20a to the electronic control unit 70. The electronic control unit 70 detects the lifter amount of the intake valve 20 based on the detection signal of the lift amount sensor 80.

  A control shaft 54 that can be driven along the axial direction of the support pipe 53 is inserted into the support pipe 53. The control shaft 54 is drivingly connected to the input unit 51 and the output unit 52 via a connecting member provided in the intermediate drive mechanism 50. When the control shaft 54 is driven along the axial direction, the input unit 51 and the output part 52 come to swing relatively. Next, the connection relationship between the control shaft 54, the input unit 51, and the output unit 52 will be described in more detail with reference to FIG. FIG. 3 is a cutaway perspective view showing the internal structure of the mediation drive mechanism 50.

  As shown in FIG. 3, the input unit 51 is provided between the pair of output units 52, and a substantially cylindrical communication space is formed inside the input unit 51 and the output unit 52. Yes. In addition, a helical spline 51h is formed on the inner peripheral surface of the input unit 51, and a helical spline 52h in which the helical spline 51h of the input unit 51 and its teeth are inclined in the opposite direction are formed on the inner peripheral surface of the output unit 52. Is formed.

  A substantially cylindrical slider gear 55 is provided in a space formed inside the input unit 51 and the output unit 52. A helical spline 55a that meshes with the helical spline 51h of the input portion 51 is formed at the central portion of the outer peripheral surface of the slider gear 55, and both ends of the outer peripheral surface mesh with the helical spline 52h of the output portion 52. A helical spline 55b is formed.

  A groove 55c extending along the circumferential direction is formed on the inner wall of the substantially cylindrical slider gear 55, and a bush 56 is fitted in the groove 55c. The bush 56 can slide on the inner peripheral surface of the groove 55c along the direction in which the groove 55c extends, but the displacement of the slider gear 55 in the axial direction is restricted.

  The support pipe 53 is inserted into a through space formed inside the slider gear 55, and the control shaft 54 is inserted into the support pipe 53. A long hole 53 a extending in the axial direction is formed in the tube wall of the support pipe 53. A locking pin 57 is provided between the slider gear 55 and the control shaft 54 to connect the slider gear 55 and the control shaft 54 through a long hole 53a. One end of the locking pin 57 is inserted into a recess (not shown) formed in the control shaft 54, and the other end is inserted into a through hole 56 a formed in the bush 56.

  In such an intermediate drive mechanism 50, when the control shaft 54 is displaced along the axial direction, the slider gear 55 is displaced in the axial direction in conjunction with the displacement. The helical splines 55a and 55b formed on the outer peripheral surface of the slider gear 55 mesh with the helical splines 51h and 52h formed on the inner peripheral surfaces of the input unit 51 and the output unit 52, respectively. When displaced in the axial direction, the input unit 51 and the output unit 52 rotate in opposite directions. As a result, the relative phase difference between the input unit 51 and the output unit 52 is changed, and the maximum lift amount of the intake valve 20 is changed.

  Here, as shown in FIG. 2, a motor 60 is provided at the base end portion (right end portion in the figure) of the control shaft 54, and this motor 60 controls the control of the internal combustion engine. It is connected to the electronic control unit 70 to be performed. The electronic control unit 70 drives the motor 60 to feedback control the maximum lift amount of the intake valve 20 based on the engine operating state. The control shaft 54 and the motor 60 constitute a changing mechanism that changes the maximum lift amount of the intake valve 20. Hereinafter, feedback control of the maximum lift amount by the electronic control unit 70 will be described with reference to FIG. Here, FIG. 4 is a block diagram showing a connection relationship among the control shaft 54, the motor 60, and the electronic control unit 70.

  As shown in FIG. 4, the base end portion of the control shaft 54 is connected to the output shaft 60 a of the motor 60 via the conversion mechanism 61. The conversion mechanism 61 is for converting the rotational motion of the output shaft 60a into the linear motion of the control shaft 54 in the axial direction. That is, when the output shaft 60a is rotated forward and backward, the rotation is converted into reciprocating movement of the control shaft 54 by the conversion mechanism 61. The control shaft 54 is formed with a locking portion 54a, and the cylinder head cover 3 of the internal combustion engine is formed with two stoppers 3a and 3b with which the locking portion 54a can come into contact. The drive is possible between two drive limit positions corresponding to the stoppers 3a and 3b. Here, when the control shaft 54 is driven to the drive limit position (hereinafter referred to as “Hi end”) corresponding to the stopper 3a, the maximum lift amount of the intake valve 20 becomes the design maximum value DH0, while the control shaft 54 is stopped. When driving to the drive limit position (hereinafter referred to as “Lo end”) corresponding to 3b, the maximum lift amount of the intake valve 20 becomes the design minimum value DL0.

  Further, as described above, the driving / stopping of the motor 60 is switched by the electronic control unit 70. Here, the electronic control unit 70 includes a nonvolatile memory 70a for storing programs and data necessary for the control and a volatile memory 70b for temporarily storing calculation results. Further, the electronic control unit 70 has sensors for detecting the operating state of the engine, such as an accelerator sensor 71 for detecting the opening degree of the accelerator pedal of the vehicle and a crank angle sensor 72 for detecting the rotational phase of the crankshaft of the internal combustion engine. It is connected. The electronic control unit 70 sets a control target value for the maximum lift amount of the intake valve 20 based on the operating state of the engine detected by these sensors, and also uses the aforementioned lift amount sensor 80 to set the maximum lift of the actual intake valve 20. Detect the amount. Then, the electronic control unit 70 reciprocates the control shaft 54 through the motor 60 so that the detected value coincides with the target value, so that the maximum lift amount of the intake valve 20 corresponds to the engine operating state. The value is changed to improve the fuel efficiency and output of the internal combustion engine.

  As described above, as a means for detecting the maximum lift amount of the intake valve 20, the lift amount sensor 80, which is a potentiometer, is used. However, due to mechanical and electrical variations, aging, etc., the lift amount sensor 80 There may be a deviation between the detected value of the maximum lift amount of the intake valve 20 detected and the actual value. Conventionally, the deviation can be suppressed by driving the control shaft to the drive limit position, learning the reference position output value corresponding to the drive limit position, and correcting the detection value of the lift amount sensor. If a failure such as a biting of the control shaft or the mediation drive mechanism occurs, the detection value of the lift amount sensor may be erroneously corrected.

Therefore, the intake valve operating apparatus 100 according to the present embodiment employs a configuration that suitably suppresses the above-described disadvantages. Hereinafter, this configuration will be described in detail.
As shown in FIG. 4, the motor 60 is provided with a movement amount sensor 62 fixed to the motor 60 body, and a multipolar magnet that rotates integrally with the output shaft 60 a corresponding to the movement amount sensor 62. Is provided. Along with the rotation of the output shaft 60a, the movement amount sensor 62 alternately outputs a pulse signal, that is, a logic high level signal and a logic low level signal according to the magnetism of the multipolar magnet. The electronic control unit 70 reads the output signal of the movement amount sensor 62 and detects the relative rotation angle of the output shaft 60a, in other words, the movement amount of the control shaft 54, based on this output signal. The intake valve operating apparatus 100 according to the present embodiment determines the presence or absence of a mechanical failure such as biting of the control shaft 54 or the intermediate drive mechanism 50 based on the amount of movement of the control shaft 54, and when such a failure exists. Further, the learning of the reference position output value is invalidated and the correction of the detection value of the lift amount sensor 80 is prohibited. Hereinafter, the procedure of the correction process of the detection value of the lift amount sensor according to the present embodiment will be described with reference to the flowchart of FIG.

  A series of processes shown in FIG. 5 is repeatedly executed by the electronic control unit 70 with a predetermined control cycle. In this process, first, in step S100, it is determined based on the output of the crank angle sensor 72 whether or not the operation of the internal combustion engine has been stopped. Here, when it is determined that the internal combustion engine is operating (step S100: NO), in order to avoid an influence on the operation of the internal combustion engine, learning of the reference position output value is not performed and this series is performed. This process is temporarily terminated. On the other hand, when it is determined that the operation of the internal combustion engine has been stopped (step S100: YES), the process proceeds to step S110.

  In step S110, the control shaft 54 is driven and controlled to the Lo end and then to the Hi end, the movement amount of the control shaft 54 detected by the movement amount sensor 62, and the lift amount sensor corresponding to the Lo end and the Hi end. 80 detected values are stored in the volatile memory 70b. Specifically, the target value of the maximum lift amount of the intake valve 20 is set to a value smaller than the design minimum value DL0, and the control shaft 54 is driven and controlled to the Lo end through the motor 60. Then, when the locking portion 54a of the control shaft 54 is abutted against the stopper 3b located on the base end side thereof and the output of the lift amount sensor 80 no longer changes, the detection of the lift amount sensor 80 corresponding to the Lo end is detected. The value DL is learned as a reference position output value corresponding to the Lo end. Next, the target value of the maximum lift amount of the intake valve 20 is set to a value larger than the design maximum value DH0, and the control shaft 54 is driven and controlled to the Hi end through the motor 60. The detected value of the lift amount sensor 80 corresponding to the Hi end when the locking portion 54a of the control shaft 54 is abutted against the stopper 3a located on the distal end side and the output of the lift amount sensor 80 no longer changes. DL is learned as a reference position output value corresponding to the Hi end. Further, the movement amount detection value P of the control shaft 54 detected by the movement amount sensor 62 while the control shaft 54 is driven and controlled from the Lo end to the Hi end is stored.

  In step S120, it is determined whether the detection values DL and DH are within the normal range. Specifically, it is determined whether or not these detection values DL and DH are values between the normal range maximum value DMAX and the normal range minimum value DMIN previously stored in the nonvolatile memory 70a. The normal range maximum value DMAX and normal range minimum value DMIN are set in consideration of variations in sensor characteristics caused by individual differences in the lift amount sensor 80 and the like. If it is determined that at least one of the detection values DL and DH is not within the normal range (step S120: NO), it is determined that a failure of the lift amount sensor 80 has occurred, and the process proceeds to step S200. The data is stored in the volatile memory 70b of the electronic control unit 70. On the other hand, if it is determined that the two detection values DL and DH are both within the normal range (step S120: YES), the process proceeds to step S130.

  In step S130, it is determined whether or not a deviation between the movement amount detection value P and the design distance P0 between the Lo end and the Hi end stored in advance in the nonvolatile memory 70a is smaller than a predetermined value. Here, when it is determined that the deviation (= P0−P) between the movement amount detection value P and the design distance P0 is larger than a predetermined value, mechanical control such as biting of the control shaft 54 and the intermediate drive mechanism 50 is performed. It is determined that the movement has stopped before the locking portion 54a of the control shaft 54 abuts against the stoppers 3a and 3b, and the process proceeds to step S300. In step S300, learning of the reference position output values corresponding to the Lo end and Hi end is invalidated, and the fact that a mechanical failure has occurred is stored in the volatile memory 70b of the electronic control unit 70. This process is temporarily terminated. That is, in this case, the correction of the maximum lift amount is prohibited.

  On the other hand, if it is determined that the deviation between the movement amount detection value P and the design distance P0 is smaller than the predetermined value, it is determined that the control shaft 54 has moved normally from the Lo end to the Hi end, and the process proceeds to step S140. In step S140, a difference ΔDL (= DL−DL0) between the detection value DL and the design minimum value DL0 and a difference ΔDH (= DH−DH0) between the detection value DH and the design maximum value DH0 are calculated. In step S150, the detection value correction map of the lift amount sensor 80 stored in the nonvolatile memory 70a is updated based on the reference position output values DL and DH and the differences ΔDL and ΔDH. finish. Specifically, as shown in FIG. 6, as the control shaft 54 moves, the actual value of the maximum lift amount of the intake valve 20 changes along the broken line in the figure, while the maximum lift amount by the lift amount sensor 80 is changed. The detected value changes along the solid line in the figure. Therefore, the deviation value ΔD between the detected value D of the maximum lift amount of the intake valve 20 by the lift amount sensor 80 and the actual value DR corresponding to the detected value D is calculated based on the following arithmetic expression (1).

ΔD = (ΔDH−ΔDL) × (D−DL) / (DH−DL) + ΔDL (1)

Then, the actual value DR of the future maximum lift amount of the intake valve 20 is corrected based on the following arithmetic expression (2).

DR ← D−ΔD (2)

According to the embodiment described above, the following effects can be obtained.

  (1) Deviation between the movement amount detection value P of the control shaft 54 detected by the movement amount sensor 62 when the control shaft 54 is driven from the Lo end to the Hi end and the design distance P0 between the Lo end and the Hi end. Is greater than a predetermined value, the control shaft 54 is driven and controlled, but is not displaced by a predetermined amount corresponding to it. Accordingly, in this case, the learning of the reference position output value of the lift amount sensor 80 is invalidated and the correction of the detection value of the lift amount sensor 80 is prohibited, so that the control shaft 54 and various mechanisms for driving it are engaged. It is possible to prevent the detection value of the lift amount sensor 80 from being erroneously corrected due to a mechanical failure such as the above.

  (2) Both the detection values DL and DH of the lift amount sensor 80 corresponding to the Lo end and the Hi end are learned as reference position output values, and the maximum corresponding to these reference position output values DL and DH and the Lo end and the Hi end The detection value of the lift amount sensor 80 is corrected based on the difference between the lift amount design values DL0 and DH0. As a result, the maximum lift amount of the intake valve 20 can be detected more accurately.

In addition, the said embodiment can also be implemented with the following forms which changed this suitably.
In the above embodiment, the maximum lift amount of the intake valve 20 is maximized when the locking portion 54a of the control shaft 54 is abutted against the stopper 3a located on the tip side thereof, and the locking portion 54a is connected to the control shaft. A configuration in which the maximum lift amount is minimized when it is abutted against the stopper 3b located on the proximal end side of 54 is illustrated. On the other hand, when the locking portion 54a of the control shaft 54 is abutted against the stopper 3a located on the distal end side thereof, the maximum lift amount of the intake valve 20 is minimized, and the locking portion 54a becomes the control shaft 54. Even if the maximum lift amount is maximized when it is abutted against the stopper 3b located on the base end side, the lift amount can be corrected in the same control mode, and a malfunction such as biting It is possible to avoid an erroneous correction of the lift amount at the time of occurrence.

  In the above embodiment, both the detection values DL and DH of the lift amount sensor 80 corresponding to the Lo end and the Hi end are learned as the reference position output value. For example, only one of the detection values DL and DH is learned. However, if sufficient correction accuracy can be obtained, only one of the detection values DL and DH may be learned as the reference position output value. That is, for example, when the deviation value ΔD between the detection value D and the actual value DR by the lift amount sensor 80 is substantially constant, only the detection value DL is learned as the reference position output value, and the deviation value ΔD is determined as the detection value DL and the design minimum. The detection value of the lift amount sensor 80 can be corrected by setting the difference ΔDL from the value DL0.

  In the above embodiment, the case where the valve operating device according to the present invention is applied to the intake valve operating device corresponding to the intake valve of the internal combustion engine is illustrated, but the present invention is applied to the exhaust valve operating device corresponding to the exhaust valve. You can also.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the partial cross-section about one Embodiment of the valve operating apparatus of the internal combustion engine concerning this invention. The top view which shows the arrangement | positioning aspect about the valve operating apparatus of the internal combustion engine concerning the embodiment. The fracture | rupture perspective view which shows the internal structure about the mediation drive mechanism of the embodiment. The block diagram which mainly shows the connection relation of the control shaft of the same embodiment, a motor, and an electronic control unit. The flow chat which shows the process sequence about the correction process of the lift amount sensor detection value of the embodiment. The figure which shows the relationship between the detected value and actual value of the maximum lift amount of the intake valve by the lift amount sensor of the embodiment.

Explanation of symbols

  2 ... cylinder head, 3 ... cylinder head cover, 3a, 3b ... stopper, 10 ... exhaust valve, 11 ... valve spring, 12 ... lash adjuster, 13 ... rocker arm, 13a ... roller, 14 ... exhaust camshaft, 15 ... cam, 16 ... Retainer, 20 ... Intake valve, 20a ... Projection, 21 ... Valve spring, 22 ... Rush adjuster, 23 ... Rocker arm, 23a ... Roller, 24 ... Intake camshaft, 25 ... Cam, 26 ... Retainer, 50 ... Intermediary drive Mechanism 51... Input section 51 a Roller 51 h Helical spline 52 Output section 52 h Helical spline 53 Support pipe 53 a Long hole 54 Control shaft 54 a Locking section 55 Slider Gear, 55a ... Helical spline, 55b ... Helical spline , 55c ... groove, 56 ... bush, 56a ... through hole, 57 ... locking pin, 60 ... motor, 60a ... output shaft, 61 ... conversion mechanism, 62 ... movement amount sensor, 70 ... electronic control unit (maximum lift amount change) 70a ... nonvolatile memory, 70b ... volatile memory, 71 ... accelerator sensor, 72 ... crank angle sensor, 80 ... lift amount sensor, 90 ... exhaust valve operating device, 100 ... intake air Valve operating device.

Claims (2)

An input portion that abuts on the cam of the internal combustion engine and swings based on the rotation thereof, an output portion that reciprocally drives the engine valve by swinging together with the input portion, and drivingly connected to the input portion and the output portion. A control shaft capable of reciprocating between two drive limit positions along the direction, and driving the control shaft in the axial direction to change the rotational phase difference between the input unit and the output unit A change mechanism that changes the maximum lift amount of the engine valve; and a lift amount sensor that detects the maximum lift amount of the engine valve; and a detection value of the lift amount sensor is a target value for the maximum lift amount of the engine valve; Maximum lift amount changing means for reciprocatingly driving the control shaft of the change mechanism so as to coincide with each other, and a small amount of each detected value of the lift amount sensor corresponding to the drive limit position In a valve operating system for an internal combustion engine and a detected value correcting means for correcting the and also learns one as the reference position output value, the detection value of the lift amount sensor based on the reference position output value,
A movement amount detecting means for detecting a movement amount of the control shaft, and detecting the movement amount of the control shaft detected by the movement amount detecting means when the control shaft is driven from one of the drive limit positions to the other; When the deviation between the value and the distance between the two drive limit positions is greater than a predetermined value, learning of the reference position output value by the detection value correction means is invalidated and correction of the detection value of the lift amount sensor is prohibited. A valve operating apparatus for an internal combustion engine, comprising: The valve operating apparatus for an internal combustion engine according to claim 1,
The detection value correcting means learns both detection values of the lift amount sensor corresponding to the two drive limit positions as reference position output values, and a reference position output value corresponding to one of the two drive limit positions; The difference between the design value of the maximum lift amount corresponding to the same drive limit position and the reference position output value corresponding to the other of the two drive limit positions and the maximum lift amount corresponding to the drive limit position are calculated. A valve operating device for an internal combustion engine, which calculates a difference from a design value and corrects a detection value of the lift amount sensor based on the two differences.

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