JP2012031741A - Control device of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device of an internal combustion engine capable of efficiently removing foreign matter entering a hydraulic control valve.SOLUTION: A variable valve system is applied to an internal combustion engine including two hydraulic phase variable mechanisms 1i, 1e operated in response to the supply of a hydraulic pressure, for variably changing valve timing of an engine valve by changing a rotation phase of a camshaft, and adjusts the supplied hydraulic pressures of both hydraulic phase variable mechanisms 1i, 1e, respectively, by driving spools 9i, 9e of hydraulic control valves 7i, 7e provided for the respective hydraulic phase variable mechanisms 1i, 1e, for each one of the hydraulic phase variable mechanisms 1i, 1e. An electronic control unit 12 executes foreign matter removal control for removing the foreign matter entering the hydraulic control valves 7i, 7e by reciprocating the spool 9i, 9e of the hydraulic control valve 7i, 7e, and commands the phase holding to the other of the hydraulic phase variable mechanisms 1i, 1e during the execution of the foreign matter removal control.

Description

  The present invention is applied to an internal combustion engine having a hydraulic phase variable mechanism that varies the valve timing of an engine valve by operating in response to the supply of hydraulic pressure to change the rotational phase of a camshaft, and a spool of a hydraulic control valve The present invention relates to a control device for an internal combustion engine that adjusts the hydraulic pressure supplied to the hydraulic phase variable mechanism by driving the hydraulic pressure.

  As is well known, most of internal-combustion engines such as onboard vehicles are equipped with variable valve mechanisms that make the valve characteristics of engine valves (intake / exhaust valves) variable. As such a variable valve mechanism, a hydraulic phase variable mechanism is known in which the valve timing of the engine valve is variable by operating according to the supply of hydraulic pressure and changing the rotational phase of the camshaft.

  The hydraulic pressure supplied to the hydraulic phase variable mechanism is adjusted in accordance with the driving of a spool that moves in a sleeve of an oil pressure control valve (OCV). The hydraulic control valve includes a return spring that constantly biases the spool to one side and a solenoid that drives the spool to the other side in response to an input of a control signal.

  If foreign matter such as swarf mixed in the working oil enters the inside of the hydraulic control valve, especially the port-spool partition formed in the sleeve, the spool will malfunction. There are things to do. Therefore, conventionally, as seen in Patent Document 1, in an internal combustion engine having a hydraulic phase variable mechanism, when a foreign object is confirmed to be caught, the spool is forcibly reciprocated to remove the caught foreign substance. Foreign matter removal control is performed.

JP 2002-030910 A

  Such foreign matter removal control has a certain effect in removing foreign matter mixed in the hydraulic control valve. However, depending on the situation, even if foreign matter removal control is performed, foreign matter may not be removed. In such a case, a failure occurs and the variable control of the valve timing by the hydraulic phase variable mechanism must be stopped. Become. Therefore, establishment of a logic for removing foreign matters more reliably is desired.

  The present invention has been made in view of such circumstances, and a problem to be solved is to provide a control device for an internal combustion engine that can more effectively remove foreign matters mixed in a hydraulic control valve. It is in.

  The invention according to claim 1 includes a plurality of hydraulic devices including a hydraulic phase variable mechanism that varies the valve timing of the engine valve by changing the rotational phase of the camshaft by operating according to the supply of hydraulic pressure. The control device for an internal combustion engine is applied to the internal combustion engine and adjusts the hydraulic pressure supplied to the hydraulic phase variable mechanism by driving a spool of a hydraulic control valve. In order to solve the above problem, the invention according to claim 1 is common with the hydraulic phase variable mechanism during execution of foreign matter removal control for removing foreign matter mixed in the hydraulic control valve by reciprocating the spool. The hydraulic pressure supply amount is controlled to be reduced with respect to other hydraulic equipment that operates by supplying hydraulic pressure from the hydraulic pressure supply source.

  When the amount of hydraulic supply to other hydraulic equipment that operates by supplying hydraulic pressure from a common hydraulic supply source is reduced, the amount of hydraulic pressure allocated to the hydraulic phase variable mechanism increases accordingly, and the hydraulic pressure before the hydraulic control valve is reduced. It will increase. If the hydraulic pressure before the hydraulic control valve is increased, the flow of oil that pushes the mixed foreign matter becomes stronger, and the foreign matter is easily removed. Therefore, according to the above configuration, it is possible to more effectively remove foreign matters mixed in the hydraulic control valve.

  In the hydraulic phase variable mechanism, the phase is maintained by stopping or close to supplying the hydraulic pressure. Therefore, another hydraulic phase variable mechanism in which the hydraulic device subject to the control of reducing the hydraulic pressure supply amount during the foreign substance removal control operates in response to the hydraulic pressure supply to vary the valve timing of the engine valve. In this case, the hydraulic pressure supply amount reduction control can be performed by instructing the other hydraulic phase variable mechanism to maintain the phase as in claim 2.

  If the phase holding of the other hydraulic phase variable mechanism at this time is performed at the phase of the outermost edge of the phase variable range, the members collide with each other due to the vibration of the phase due to the fluctuation of the cam torque. Sound may be generated. In order to avoid the occurrence of such a hitting sound, as in claim 3, the phase maintenance commanded during the execution of the foreign matter removal control is performed so that the outermost edge (the most advanced angle phase, the most advanced angle phase) of the phase variable range of the hydraulic phase variable mechanism. It is preferable to carry out in a phase other than (retard angle phase).

  On the other hand, the invention according to claim 4 is an internal combustion engine comprising two hydraulic phase variable mechanisms that change the valve timing of the engine valve by operating in response to the supply of hydraulic pressure and changing the rotational phase of the camshaft. And a control device for an internal combustion engine that adjusts the hydraulic pressure supplied to both the hydraulic phase variable mechanisms by driving a spool of a hydraulic control valve provided for each hydraulic phase variable mechanism. In order to solve the above problems, in the invention according to claim 4, the foreign matter removal control for removing foreign matter mixed in the hydraulic control valve by reciprocating the spool of one hydraulic control valve of the hydraulic phase variable mechanism. In addition, during the execution of the foreign substance removal control, another hydraulic phase variable mechanism is instructed to hold the phase.

  In the hydraulic phase variable mechanism, the phase is maintained by stopping or close to supplying the hydraulic pressure. Therefore, in addition to the foreign matter removal control of one hydraulic phase variable mechanism, if the other hydraulic phase variable mechanism sharing the hydraulic pressure generation source is instructed to hold the phase, the amount of hydraulic pressure supplied to the other hydraulic phase variable mechanism Therefore, the hydraulic pressure allocation of one hydraulic phase variable mechanism increases accordingly. As a result, the hydraulic pre-valve hydraulic pressure of the hydraulic phase variable mechanism that is executing the foreign matter removal control is increased, the oil flow that pushes the mixed foreign matter is stronger, and the foreign matter is easily removed. become. Therefore, according to the above configuration, it is possible to more effectively remove foreign matters mixed in the hydraulic control valve.

  Even in such a configuration, as in claim 5, the phase holding of the other hydraulic phase variable mechanism is performed at the outermost edge (the most advanced angle phase, the slowest phase) of the phase variable range of the hydraulic phase variable mechanism. If it is performed in a phase other than (angular phase), it is possible to avoid the occurrence of hitting sound due to the collision between members due to phase vibration caused by cam torque fluctuations.

1 is a schematic diagram schematically showing the configuration of a variable valve system of an internal combustion engine to which an embodiment of the present invention is applied. Sectional view showing the state of the hydraulic control valve at the time of phase advance Sectional drawing which shows the state of the hydraulic control valve at the time of phase retardation. Sectional drawing which shows the state of the hydraulic control valve at the time of a phase maintenance. Time chart showing an example of control mode before and after execution of foreign matter removal control The flowchart which shows the process sequence of a phase maintenance control routine.

  Hereinafter, an embodiment of a control device for an internal combustion engine according to the present invention will be described in detail with reference to FIGS. In the present embodiment, the control device of the present invention is applied to an internal combustion engine provided with a phase variable mechanism in both valve systems on the intake side and the exhaust side.

  In the following description, a member provided on the intake side of the internal combustion engine is suffixed with “i”, and a member provided on the exhaust side is suffixed with “e”. To distinguish. Further, when the intake side and the exhaust side are not distinguished, “i” and “e” at the end of the reference numerals are omitted. For example, “hydraulic phase variable mechanism 1 i” indicates an intake side hydraulic phase variable mechanism, and “hydraulic phase variable mechanism 1 e” indicates an exhaust side hydraulic phase variable mechanism. “Hydraulic phase variable mechanism 1” indicates both the intake side and exhaust side hydraulic phase variable mechanisms.

  FIG. 1 shows the configuration of a variable valve system of an internal combustion engine to which the present embodiment is applied. As shown in the figure, the internal combustion engine to which the present embodiment is applied is provided with two mechanisms, an intake-side hydraulic phase variable mechanism 1i and an exhaust-side hydraulic phase variable mechanism 1e.

  These hydraulic phase variable mechanisms 1 include two rotating bodies including a vane rotor 2 and a housing 3 that accommodates the vane rotor 2. The vane rotor 2 has a substantially cylindrical shape with vanes protruding from the outer periphery, and is connected to the camshaft so as to be integrally rotatable. The housing 3 has a substantially annular shape with a recess formed on the inner periphery thereof, and is connected to a cam sprocket of the internal combustion engine so as to be integrally rotatable. The vane rotor 2 and the housing 3 are coaxially rotatable.

  The interior of the recess in the inner periphery of the housing 3 is divided into two oil chambers by being divided by the vanes of the vane rotor 2. Among these, the oil chamber formed on the vane camshaft counter-rotation direction side is an advance oil chamber 4 into which hydraulic pressure for rotating the vane rotor 2 relative to the advance side (camshaft rotation direction) is introduced. It has become. Further, the oil chamber formed on the camshaft rotation direction side of the vane is a retarding oil chamber 5 into which oil pressure for rotating the vane rotor 2 relative to the retarding side (coshaft counter-rotating direction) is introduced. .

  The hydraulic phase variable mechanism 1 is provided with a lock mechanism 6. The lock mechanism 6 is mechanically configured so that the vane rotor 2 and the housing 3 can be rotated together by inserting a lock pin disposed in one of the vanes of the vane rotor 2 into a locking hole formed in the housing 3. Is engaged.

  The lock mechanism 6i of the hydraulic phase variable mechanism 1i on the intake side has the vane rotor 2i and the housing at the most retarded phase, that is, at the position when the vane rotor 2i is most rotated relative to the housing 3i in the camshaft counter-rotating direction. 3i is engaged so that integral rotation is possible. Further, the lock mechanism 6e of the hydraulic phase variable mechanism 1e on the exhaust side has the vane rotor 2e and the housing at the most advanced angle phase, that is, at the position when the vane rotor 2e rotates most relative to the housing 3e in the camshaft rotation direction. 3e is engaged so that integral rotation is possible.

  In such a variable valve system of the internal combustion engine provided with the hydraulic phase variable mechanisms 1i and 1e, the intake side and exhaust side hydraulic control valves (corresponding to the two hydraulic phase variable mechanisms 1i and 1e, respectively) OCV) 7i, 7e. The hydraulic control valve 7 includes a sleeve 8 formed in a circular shape and a spool 9 disposed in the sleeve 8 so as to be capable of reciprocating. The hydraulic control valve 7 incorporates a return spring that constantly urges the spool 9 to one side and an electromagnetic solenoid that drives the spool 9 to the other side in response to current supply.

  The sleeve 8 of the hydraulic control valve 7 includes an advance port a connected to the advance oil chamber 4 of the hydraulic phase variable mechanism 1, a retard port r connected to the retard oil chamber 5, and a hydraulic pressure generation source. A supply port s connected to the oil pump 11 and two drain ports d connected to the oil pan 10 are formed. The communication relationship of each port is changed according to the drive position of the spool 9 in the sleeve 8.

  These hydraulic control valves 7i and 7e are controlled by an electronic control unit (ECU) 12 that controls the engine. The electronic control unit 12 includes a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and an input / output port (I / O). The CPU executes various arithmetic processes related to engine control, and the ROM stores a control program and data. The RAM temporarily stores the calculation results of the CPU, the detection results of the sensors, and the like, and the I / O functions as an interface that mediates exchange of signals with the outside. Note that detection signals of cam phase sensors 13i and 13e that detect the rotation phases of the intake and exhaust camshafts are input to the input port of the electronic control unit 12, respectively.

  In the variable valve system configured as described above, the electronic control unit 12 controls the two hydraulic control valves 7i and 7e to drive the intake-side and exhaust-side hydraulic phase variable mechanisms 1i and 1e. The phase (valve timing) of the intake valve and the exhaust valve is variable. This phase control is basically performed so that the actual phase of the engine valve is set to a target phase set according to the engine operating condition. That is, the electronic control unit 12 controls the hydraulic control valve 7 to advance the actual phase when the actual phase is on the retard side with respect to the target phase, and the actual phase is on the advance side with respect to the target phase. Sometimes, the hydraulic control valve 7 is controlled so as to retard the actual phase. When the actual phase matches the target phase, the hydraulic control valve 7 is controlled to maintain the current phase. Such control of the hydraulic control valve 7 is performed by duty-controlling the drive current of the electromagnetic solenoid.

  FIG. 2 shows a state of the hydraulic control valve 7 at the time of phase advance. The spool 9 at this time is driven to a position where the advance port a and the supply port s communicate with each other and the retard port r and the drain port d communicate with each other. Therefore, in the hydraulic phase variable mechanism 1 at this time, the hydraulic pressure is applied to the advance oil chamber 4 and the hydraulic pressure is released from the retard oil chamber 5, thereby causing the vane rotor 2 to move relative to the housing 3. The camshaft is relatively rotated in the camshaft rotation direction.

  FIG. 3 shows the state of the hydraulic control valve 7 when the phase is retarded. The spool 9 at this time is driven to a position where the advance port a and the drain port d communicate with each other and the retard port r and the supply port s communicate with each other. Therefore, in the hydraulic phase variable mechanism 1 at this time, the hydraulic pressure is released from the advance oil chamber 4 and the hydraulic pressure is applied to the retard oil chamber 5, thereby causing the vane rotor 2 to move relative to the housing 3. The camshaft is relatively rotated in the camshaft counter-rotating direction.

  FIG. 4 shows a state of the hydraulic control valve 7 when the phase is maintained. The spool 9 at this time is driven to a position that closes the advance port a and the retard port r. Therefore, in the hydraulic phase variable mechanism 1 at this time, the oil supply / discharge to the advance oil chamber 4 and the retard oil chamber 5 is stopped, and the relative rotation phase of the vane rotor 2 with respect to the housing 3 is the current state. Is retained.

  Now, in such a hydraulic control valve 7 of the variable valve system, foreign matter such as chips mixed in the working oil at the time of cutting in the inside, in particular, the partition part between the port formed in the sleeve 8 and the spool 9. May bite. If such foreign matter is caught, the operation of the spool 9 may be defective and the operation of the hydraulic phase variable mechanism 1 may not be controlled. Therefore, in the present embodiment, whether or not such foreign matter is caught is monitored, and when the occurrence of foreign matter is confirmed, the spool 9 is forcibly reciprocated to remove the foreign matter. Foreign matter removal control for removal is performed. The occurrence of foreign object biting at this time is confirmed by the fact that the state where the difference between the actual phase and the target phase is equal to or greater than the predetermined biting determination value continues for the predetermined biting determination time or longer. It has become.

  In the control apparatus for an internal combustion engine according to the present embodiment, the following control is performed so that the removal of foreign matters in such foreign matter removal control can be performed more effectively. That is, in the present embodiment, during the execution of the foreign substance removal control for one hydraulic phase variable mechanism 1i, 1e, the other hydraulic phase variable mechanism 1i, 1e is instructed to hold the phase. When the phase holding command is issued, the hydraulic phase variable mechanism 1 that has received the phase holding command is in a state where no positive hydraulic pressure is supplied to either the advance oil chamber 4 or the retard oil chamber 5. . When the hydraulic pressure supply to one hydraulic phase variable mechanism 1 is stopped in this way, the hydraulic pressure allocation of the other hydraulic phase variable mechanism 1, that is, the hydraulic phase variable mechanism 1 that is executing the foreign matter removal control is correspondingly reduced. Will increase. As a result, the hydraulic pressure before the hydraulic control valve of the hydraulic phase variable mechanism 1 that is executing the foreign matter removal control is increased, the oil flow that pushes the foreign matter mixed in becomes stronger, and the foreign matter is easily removed. It becomes like this.

  FIG. 5 shows an example of the control mode before and after the foreign matter removal control of the present embodiment. In the example of the figure, the case where the foreign matter removal control is performed for the hydraulic phase variable mechanism 1e on the exhaust side is shown. In the figure, the duty ratio of the drive current supplied to the solenoid of the exhaust side hydraulic control valve (EX-OCV) 7e, the operating position of the spool 9e of the hydraulic control valve 7e, and the hydraulic phase of the intake side are also shown. The transition of the target phase and the actual phase of the variable mechanism (IN-VVT) 1i is shown.

  Prior to the start of foreign matter removal control, both the intake-side and exhaust-side hydraulic phase variable mechanisms 1i, 1e are subjected to phase variable control in accordance with the engine operating conditions. When it is confirmed that foreign matter is caught in the hydraulic control valve 7e of the exhaust-side hydraulic phase varying mechanism 1e, foreign matter removal control is executed. The foreign matter removal control is performed by repeatedly switching the duty ratio of the drive current of the hydraulic control valve 7e on the exhaust side alternately between “0%” and “100%”.

  On the other hand, in the hydraulic phase variable mechanism 1i on the intake side at this time, the phase control corresponding to the engine operating condition is interrupted and the target phase is defined while the foreign matter removal control of the hydraulic phase variable mechanism 1e on the exhaust side is being executed. Is set to the holding phase α. When the phase change to the holding phase α is completed, the hydraulic phase variable mechanism 1 i is instructed to hold the phase at the holding phase α.

  In the present embodiment, the holding phase α at this time is set to a phase slightly advanced from the most retarded phase. Originally, in this internal combustion engine, from the viewpoint of ensuring a good combustion state, it is desirable that the phase of the hydraulic phase variable mechanism 1i on the intake side during the foreign matter removal control is the most retarded phase. There are the following reasons for setting α to the above phase. That is, since the hydraulic pressure is not positively supplied to the advance oil chamber 4i and the retard oil chamber 5i while the phase is maintained, the oil pressure in both oil chambers (4i, 5i) has elapsed over time due to oil leakage. Decreases with. When the hydraulic pressure is reduced, phase retention failure occurs and phase vibration is caused by cam torque fluctuations, and the vane of the vane rotor 2i may collide with the concave side wall of the housing 3i to generate a hitting sound. Further, in this hydraulic phase variable mechanism 1i, since the most retarded phase is also the lock phase of the lock mechanism 6i, a hitting sound may be generated even if the lock pin is removed. For this reason, in the present embodiment, the position shifted from the most retarded phase where there is a concern about the occurrence of the hitting sound is set as the holding phase α.

  Incidentally, when foreign matter removal control is executed for the intake-side hydraulic phase variable mechanism 1i, the exhaust-side hydraulic phase variable mechanism 1e is instructed to hold the phase. At this time, the holding phase of the hydraulic phase variable mechanism 1e on the exhaust side is set to a phase slightly retarded from the most advanced angle phase.

  FIG. 6 shows a flowchart of a phase holding control routine employed in the present embodiment. The processing of this routine is repeatedly executed by the electronic control unit 12 at regular control cycles during engine operation.

  When this routine is started, first, in step S100, it is determined whether or not any of the hydraulic phase variable mechanisms 1i and 1e is executing the foreign matter removal control. If the foreign matter removal control is not executed in any of the hydraulic phase variable mechanisms 1i and 1e (NO), the process of this routine is terminated as it is. If not (YES), the process proceeds to step S200. Is migrated. When the process proceeds to step S200, in step S200, phase holding is commanded to the other hydraulic phase variable mechanisms 1i and 1e that are not the mechanism that is executing the foreign matter removal control. .

  In this embodiment, the oil pump 11 corresponds to the hydraulic pressure generation source. Further, in the present embodiment, the hydraulic phase variable mechanisms 1i and 1e that are not subjected to the foreign matter removal control are configured to correspond to the other hydraulic devices.

According to the control apparatus for an internal combustion engine of the present embodiment described above, the following effects can be obtained.
(1) In this embodiment, the foreign matter mixed in the hydraulic control valve 7 is removed by forcibly reciprocating the spool 9 of the hydraulic control valve 7 of one of the hydraulic phase variable mechanisms 1i and 1e. Foreign matter removal control is executed. During execution of such foreign matter removal control, the other hydraulic phase variable mechanisms 1e and 1i are instructed to hold the phase.

  The hydraulic phase variable mechanism 1 holds the phase by stopping the hydraulic pressure supply. Therefore, in addition to the foreign matter removal control of one hydraulic phase variable mechanism 1i, 1e, if the other hydraulic phase variable mechanism 1e, 1i sharing the hydraulic pressure generation source is instructed to hold the phase, the other hydraulic phase variable mechanism is controlled. The amount of hydraulic pressure supplied to the mechanisms 1e and 1i is reduced, and accordingly, the hydraulic pressure is allocated to the hydraulic phase variable mechanisms 1i and 1e that are executing the foreign matter removal control. As a result, the hydraulic pre-valve hydraulic pressure of the hydraulic phase variable mechanisms 1i and 1e that are executing the foreign matter removal control is increased, and the flow of oil that pushes the mixed foreign matter becomes stronger and the foreign matter is removed. It becomes easy to be done. Therefore, according to the present embodiment, it is possible to more effectively remove foreign matters mixed in the hydraulic control valve 7.

  (2) In the present embodiment, the phase holding of the hydraulic phase variable mechanisms 1e and 1i not performing the foreign substance removal control is performed at a phase other than the outermost edge of the phase variable range of the hydraulic phase variable mechanisms 1e and 1i. I am doing so. Therefore, it is possible to avoid the occurrence of hitting sound due to the collision between members due to phase vibration caused by cam torque fluctuations.

In addition, the said embodiment can also be changed and implemented as follows.
In the above embodiment, when the phase is maintained, the hydraulic pressure supply of the hydraulic phase variable mechanism 1 is completely stopped. However, in order to compensate for the oil leaked from the oil chamber, there is a slight amount during the phase maintenance. There is also a hydraulic phase variable mechanism configured to continue the hydraulic supply. Even in such a hydraulic phase variable mechanism, the hydraulic pressure supply amount is greatly reduced during the phase holding. Therefore, if the phase holding is commanded in accordance with the foreign substance removal control, the hydraulic phase variable mechanism that is executing the foreign substance removal control is set. The hydraulic pressure allocation can be increased. Therefore, even with such a hydraulic phase variable mechanism, it is possible to remove foreign matters more effectively by instructing phase holding during execution of foreign matter removal control.

  In the above embodiment, the intake-side hydraulic phase variable mechanism 1i is slightly advanced from the most retarded phase, and the exhaust-side hydraulic phase variable mechanism 1e is slightly advanced from the most advanced angle phase. Each phase on the retard side is set as a holding phase. However, the holding phase may be set to an arbitrary phase appropriate for the operation of the internal combustion engine. Even in such a case, if the holding phase is set to a phase other than the outermost edge (the most advanced angle phase or the most retarded angle phase) of the phase variable range, it is possible to prevent the occurrence of hitting sound. In addition, if the occurrence of the hitting sound does not cause a problem, the outermost edge (the most advanced angle phase and the most retarded angle phase) of the phase variable range may be set as the holding phase.

  In the above embodiment, the occurrence of foreign object biting is confirmed when the state where the difference between the actual phase and the target phase is equal to or greater than the prescribed biting judgment value continues for the prescribed biting judgment time. It was like that. Confirmation of the occurrence of foreign object biting can also be performed by other methods.

  In the above embodiment, the hydraulic phase variable mechanism 1 including the lock mechanism 6 is used. However, the control device of the present invention is similarly applied to an internal combustion engine including a hydraulic phase variable mechanism not including the lock mechanism 6. Can be applied to.

  In the above embodiment, during execution of the foreign matter removal control for one hydraulic phase variable mechanism 1i, 1e, the other hydraulic phase variable mechanism 1e, 1i is instructed to hold the phase, thereby providing the hydraulic pressure. Reduction control of the hydraulic pressure supply amount of the type phase variable mechanisms 1e and 1i is performed. However, if there is another hydraulic device that operates by supplying hydraulic pressure from a hydraulic supply source that is common to the hydraulic phase variable mechanisms 1i and 1e that are executing the foreign substance removal control, the amount of hydraulic pressure supplied to the hydraulic device is reduced. However, it is possible to more effectively remove foreign matters mixed in the hydraulic control valve 7. For example, a hydraulic lift variable mechanism that varies the valve lift amount of the engine valve by switching a cam that operates according to the supply of hydraulic pressure to drive the engine valve is a common hydraulic pressure with the hydraulic phase variable mechanisms 1i and 1e. When the hydraulic pressure is supplied from the supply source, the hydraulic pressure supply to the hydraulic lift variable mechanism is stopped or reduced during the foreign matter removal control. Even in this case, it is possible to more effectively remove foreign substances.

  In the above embodiment, the case where the control device of the present invention is applied to the internal combustion engine including the two hydraulic phase variable mechanisms 1i and 1e has been described. However, in the internal combustion engine including only the single hydraulic phase variable mechanism. Also, the control device of the present invention can be applied. In such a case, if the reduction control of the hydraulic pressure supply amount to other hydraulic equipment that operates by the hydraulic pressure supply from the hydraulic pressure supply source common to the hydraulic phase variable mechanism is performed during the foreign substance removal control, Can be more effectively removed.

  1 (1i, 1e) ... Hydraulic phase variable mechanism, 2 (2i, 2e) ... Vane rotor, 3 (3i, 3e) ... Housing, 4 (4i, 4e) ... Advance oil chamber, 5 (5i, 5e) ... retardation oil chamber, 6 (6i, 6e) ... lock mechanism, 7 (7i, 7e) ... hydraulic control valve, 8 (8i, 8e) ... sleeve, 9 (9i, 9e) ... spool, 10 ... oil pan, DESCRIPTION OF SYMBOLS 11 ... Oil pump (hydraulic pressure generation source), 12 ... Electronic control unit, 13 (13i, 13e) ... Cam phase sensor

Claims (5)

Applied to an internal combustion engine having a plurality of hydraulic devices including a hydraulic phase variable mechanism that varies the valve timing of the engine valve by operating according to the supply of hydraulic pressure and changing the rotational phase of the camshaft. In the control device for an internal combustion engine that adjusts the hydraulic pressure supplied to the hydraulic phase variable mechanism by driving the spool of
Other hydraulic pressures that operate by supplying hydraulic pressure from a hydraulic pressure supply source that is common to the hydraulic phase variable mechanism during execution of foreign matter removal control for removing foreign matter mixed in the hydraulic control valve by reciprocating the spool. A control apparatus for an internal combustion engine, which performs control for reducing the amount of hydraulic pressure supplied to a device. The other hydraulic device is another hydraulic phase variable mechanism that operates in response to the supply of hydraulic pressure to vary the valve timing of the engine valve. The control apparatus for an internal combustion engine according to claim 1, wherein the hydraulic pressure supply amount is reduced by instructing a hydraulic phase variable mechanism to maintain the phase. The control apparatus for an internal combustion engine according to claim 2, wherein the phase holding of the other hydraulic phase variable mechanism is performed at a phase other than the outermost edge of the phase change range of the hydraulic phase variable mechanism. This is applied to an internal combustion engine having two hydraulic phase variable mechanisms that change the valve timing of the engine valve by changing the rotational phase of the camshaft by operating according to the supply of hydraulic pressure. In a control device for an internal combustion engine that adjusts the supply hydraulic pressure of both hydraulic type phase variable mechanisms by driving a spool of a hydraulic control valve provided,
One of the hydraulic phase variable mechanisms performs foreign matter removal control for removing foreign matter mixed in the hydraulic control valve by reciprocating the spool of the hydraulic control valve, and during the foreign matter removal control, A control device for an internal combustion engine, which commands phase maintenance to one hydraulic phase variable mechanism. The control apparatus for an internal combustion engine according to claim 4, wherein the phase holding of the other hydraulic phase variable mechanism is performed at a phase other than the outermost edge of the phase variable range of the hydraulic phase variable mechanism.

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