JP2018135998A - Valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve device which can restrain abrasion of a valve seat or a valve occurring in removing a foreign matter.SOLUTION: A valve device includes: valve seats 22a, 23a having flow passages 22b, 23b formed in a state of penetrating therethrough; a valve 30 for opening and closing the flow passages 22b, 23b; a motor 40 for driving the valve 30; and a control section 50 which can control operation of the valve 30 by controlling the motor 40, and can perform closing operation for operating the valve 30 so as to close the flow passages 22b, 23b, and pressing operation for pressing the valve 30 to the valve seats 22a, 23a. The control section 50 adjusts driving force of the valve 30 in the pressing operation in accordance with the driving force of the valve 30 when the closing operation is performed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technology of a valve device for opening and closing a flow path.

  Conventionally, the technology of a valve device for opening and closing a flow path is known. For example, as described in Patent Document 1.

  The valve device described in Patent Document 1 is an EGR valve provided in an EGR passage for returning engine exhaust gas to the intake side. The valve device includes a valve seat and a poppet type valve member. The valve device holds the valve member for a predetermined time in a state where the valve member is slightly lifted with respect to the valve seat when the engine is in a specific engine state (for example, when the engine speed is high). Thereby, the valve member and the valve seat are caused to collide by using the pulsation generated by the exhaust gas, and the soot adhering to the valve seat or the valve member is shaken off. Thereby, the deterioration of the shut-off property due to the sticking to the valve seat or the valve member is suppressed.

  However, since the valve device uses pulsation due to exhaust gas, there is a possibility that a high load is applied to the valve member and the valve seat due to a strong collision between the valve member and the valve seat. Thus, in the said valve apparatus, when removing a foreign material, the load concerning a valve member, a valve seat, etc. cannot be controlled, but a valve member, a valve seat, etc. may become easy to wear.

JP 2011-252406 A

  The present invention has been made in view of the above situation, and a problem to be solved by the present invention is to provide a valve device capable of suppressing wear of a valve seat and a valve that occurs when removing foreign matter. It is.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, the valve seat through which the flow path is formed, a valve for opening and closing the flow path, a drive unit that drives the valve, and the valve by controlling the drive unit A control unit capable of performing the closing operation of operating the valve so as to close the flow path and the pressing operation of pressing the valve against the valve seat. The control unit adjusts the driving force of the valve during the pressing operation according to the driving force of the valve when the closing operation is performed.

  According to a second aspect of the present invention, the driving force of the valve when the closing operation is performed is a driving force of the valve when the closing operation is finished.

  According to a third aspect of the present invention, when the driving force of the valve at the time when the closing operation is finished is greater than 0, the control unit performs the pressing operation with a driving force that is equal to or greater than the driving force.

  According to a fourth aspect of the present invention, the controller performs the pressing operation every time the closing operation is performed.

  According to a fifth aspect of the present invention, the control unit performs the pressing operation only when the driving force of the valve at the time when the closing operation is finished exceeds a predetermined threshold value.

  According to a sixth aspect of the present invention, the driving unit is configured to be able to drive the valve by supplying electric power, and the driving force of the valve is changed by switching on / off of the applied voltage according to a duty ratio. The controller determines the driving force of the valve when the closing operation is performed based on the duty ratio.

  According to a seventh aspect of the present invention, the drive unit is configured to be able to drive the valve by being supplied with electric power, and changes the driving force of the valve according to the magnitude of the current value. The valve driving force when the closing operation is performed based on the current value is determined.

  According to an eighth aspect of the present invention, the valve is constituted by a butterfly valve that opens and closes the flow path by rotating.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect of the present invention, it is possible to suppress wear of the valve seat and the valve that occurs when removing foreign matter.

  In claim 2, the configuration can be simplified.

  In Claim 3, the foreign material adhering to a valve seat or a valve | bulb can be removed effectively.

  In Claim 4, it can suppress that a foreign material accumulates.

  According to the fifth aspect, the load on the drive unit can be reduced.

  According to the sixth aspect, the driving force of the valve when the closing operation is performed can be easily determined.

  According to the seventh aspect, it is possible to easily determine the driving force of the valve when the closing operation is performed.

  According to the eighth aspect of the present invention, in the butterfly valve, it is possible to suppress the occurrence of malfunction due to foreign matters attached to the valve seat or the valve.

Front sectional drawing which showed the structure of the valve apparatus. The expanded front sectional view of the valve | bulb and valve seat which closed the flow path. Front sectional drawing which showed the state which opened the flow path. The expanded front sectional view which showed a mode that a valve was pressed on a valve seat. The graph which showed the opening degree and duty ratio of the valve | bulb when a bag is not biting. The graph which showed the opening degree and duty ratio of the valve | bulb when the accumulated soot bites. The graph which showed the opening degree and duty ratio of the valve | bulb when a slight amount of soot was bitten.

  In the following description, the directions indicated by the arrow U, arrow D, arrow L, and arrow R in the figure are defined as an upward direction, a downward direction, a left direction, and a right direction, respectively.

  Below, the valve apparatus 10 which concerns on one Embodiment of this invention is demonstrated.

  The valve device 10 is for controlling the flow of fluid. The valve device 10 according to the present embodiment is used for an exhaust control valve (not shown) of an engine. As shown in FIG. 1, the valve device 10 includes a housing 20, a valve 30, a motor 40, a control unit 50, and the like.

  The housing 20 forms flow paths 22b and 23b for fluid (exhaust gas in this embodiment). The housing 20 is formed in a substantially cylindrical shape. The housing 20 includes a through hole 21, a right sleeve 22, and a left sleeve 23.

  The through hole 21 is a hole that penetrates the housing 20 in the left-right direction. The through hole 21 is formed in a substantially circular shape when viewed from the side. The through hole 21 according to the present embodiment is formed such that the right half is one step lower than the left half.

  As shown in FIGS. 1 and 2, the right sleeve 22 is a substantially cylindrical member fitted into the right half (one step lower portion) of the through hole 21. The right sleeve 22 includes a valve seat 22a and a flow path 22b. The valve seat 22 a is formed at the left end portion on the inner peripheral surface of the right sleeve 22. The valve seat 22a increases in diameter toward the left. The flow path 22 b is an internal space of the right sleeve 22. The fluid flows from the right part to the left part of the flow path 22b. That is, the right part of the flow path 22b is the upstream side in the fluid flow direction. Further, the left part of the flow path 22b is on the downstream side in the fluid flow direction.

  The left sleeve 23 is a substantially cylindrical member fitted into the left half of the through hole 21. The right end of the left sleeve 23 is abutted with the left end of the right sleeve 22, and the axis of the left sleeve 23 is disposed at a position higher than the axis of the right sleeve 22. Such a left sleeve 23 includes a valve seat 23a and a flow path 23b. The valve seat 23 a is formed at the right end portion (the end portion on the side abutted with the right sleeve 22) on the inner peripheral surface of the left sleeve 23. The valve seat 23a increases in diameter toward the right. The flow path 23 b is an internal space of the left sleeve 23. The fluid flowing through the flow path 22b flows into the flow path 23b from the right part thereof. The fluid flows through the flow path 23b in the left direction, and flows out of the housing 20 from the left portion of the flow path 23b.

  The valve 30 is a member for opening and closing the flow paths 22b and 23b. The valve 30 includes a main body 31 and a shaft 32.

  The main body 31 is a member formed in a substantially disc shape. The main body 31 includes an upper seal surface 31a and a lower seal surface 31b.

  The upper seal surface 31 a is a surface that seals the valve seat 22 a of the right sleeve 22. The upper seal surface 31 a shown in FIG. 1 is formed on substantially the upper half of the outer peripheral surface of the main body 31. The upper seal surface 31 a is formed from the right end portion to the left end portion of the main body portion 31. The upper seal surface 31a increases in diameter toward the left.

  The lower seal surface 31 b is a surface that seals the valve seat 23 a of the left sleeve 23. The lower seal surface 31 b shown in FIG. 1 is formed on the substantially lower half of the outer peripheral surface of the main body 31. Further, the lower seal surface 31 b is formed from the left end portion to the right end portion of the main body portion 31. The lower seal surface 31b increases in diameter toward the right.

  The shaft 32 is a substantially columnar member for rotatably supporting the main body 31. The shaft 32 is arranged with its axial direction oriented in a direction perpendicular to the plane of the drawing (a direction perpendicular to the vertical direction and the horizontal direction). The shaft 32 includes a slit 32a. The slit 32a is formed so as to penetrate the shaft 32 in the radial direction (vertical direction in FIG. 1).

  The main body 31 of the valve 30 is fitted into the slit 32a of the shaft 32 and is fastened by a fastening member (not shown) such as a screw so as to be relatively non-rotatably supported by the shaft 32. The main body portion 31 is disposed at the left and right central portion of the through hole 21. The shaft 32 is rotatably supported by the housing 20 via a bearing (not shown) or the like. The opening degree of the valve 30 (the rotation angle of the main body 31) is appropriately changed as the shaft 32 rotates.

  As shown in FIG. 3, the valve 30 is configured such that the plate surface of the main body portion 31 faces up and down by the rotation of the shaft 32, so that the orientation of the plate surface of the main body portion 31 with respect to the fluid flow direction (left and right direction). It is perpendicular to the state where the fluid is most likely to flow (fully open state). Hereinafter, the opening degree at which the plate surface of the main body 31 faces up and down is referred to as “full opening degree A1”.

  Further, as shown in FIGS. 1 and 2, the valve 30 is configured so that the plate surface of the main body portion 31 faces left and right by the rotation of the shaft 32, so The direction of the plate surface is parallel, and the fluid is difficult to flow (fully closed state). Hereinafter, the opening degree at which the plate surface of the main body portion 31 faces right and left is referred to as a “fully closed opening degree A0”. In the present embodiment, even when the valve 30 has the fully closed opening A0, a clearance C is formed between the outer peripheral surface of the main body 31 and the inner peripheral surfaces of the right sleeve 22 and the left sleeve 23.

  The valve 30 is further rotated from the fully closed opening A0 in the direction of closing the flow paths 22b and 23b (clockwise direction shown in FIG. 2), so that the upper seal surface 31a of the main body 31 and the right sleeve 22 The valve seat 22a abuts (see FIG. 4), and the lower seal surface 31b of the main body 31 and the valve seat 23a of the left sleeve 23 abut. Hereinafter, the opening degree at which the upper seal surface 31a and the lower seal surface 31b contact the valve seats 22a and 23a is referred to as “contact opening degree A2”.

  A motor 40 shown in FIG. 1 is a drive source for driving the valve 30. The motor 40 has a drive shaft (not shown) connected to the shaft 32. The motor 40 can change the rotation angle of the main body 31 (the opening degree of the valve 30) by rotating the shaft 32 by rotating the drive shaft.

  The control unit 50 is for controlling the operation of the valve 30 via the motor 40. The control unit 50 includes an arithmetic device such as a CPU (Central Processing Unit), a storage device such as a ROM (Read Only Memory) and a RAM (Random Access Memory). The control unit 50 is configured such that various arithmetic processes can be executed by the arithmetic device based on various control programs and maps stored in the storage device. The control unit 50 according to the present embodiment stores information on the fully closed opening A0, the fully opened opening A1, and the contact opening A2 of the valve 30 in the storage device.

  The control unit 50 is connected to the motor 40. The control unit 50 can turn on and off the voltage applied to the motor 40 by rotating the drive shaft by transmitting a pulse width modulation signal to the motor 40. Thereby, the control part 50 can adjust the opening degree of the valve | bulb 30 within the opening range from the fully open opening degree A1 to the contact opening degree A2. In addition, the control unit 50 adjusts the current value supplied to the motor 40, that is, the driving force of the valve 30, by adjusting the duty ratio, which is the ratio of the ON period in one cycle, in the pulse width modulation signal. Configured to be possible. Moreover, the control part 50 can acquire such a duty ratio and can perform a calculation process suitably.

  Moreover, the control part 50 is comprised so that acquisition of the opening degree of the valve | bulb 30 is possible. The control unit 50 according to the present embodiment is connected to, for example, a sensor that detects the opening degree of the valve 30 and acquires the opening degree of the valve 30 by transmitting a predetermined signal from the sensor.

  The control unit 50 configured as described above is configured to be able to execute a closing operation and a pressing operation which will be described later.

  Next, the closing operation and the pressing operation will be described with reference to FIGS.

  In the following description, a case where the closing operation and the pressing operation are performed on the valve 30 having the fully opened opening A1 illustrated in FIG. 3 will be described as an example.

  First, the control unit 50 performs a closing operation on the valve 30 having the fully opened opening A1. The closing operation is an operation of rotating the valve 30 until the fully closed opening A0 (the state shown in FIGS. 1 and 2) is reached. When performing the closing operation, the controller 50 drives the motor 40 to rotate the valve 30 (main body 31) in the clockwise direction in FIG. At this time, the control unit 50 appropriately changes the driving force (duty ratio) of the valve 30.

  Specifically, as shown in FIG. 5, when starting the closing operation, the control unit 50 gradually increases the duty ratio until the closing duty ratio D1 is reached. And the control part 50 rotates the valve | bulb 30 until it becomes the opening degree close | similar to the fully closed opening degree A0, maintaining a duty ratio at the constant value (duty ratio D1 at the time of obstruction | occlusion). Thereafter, the control unit 50 gradually decreases the duty ratio (driving force), and sets the duty ratio to 0 when the fully closed opening A0 is reached. As described above, the control unit 50 ends the closing operation.

  When the closing operation is completed, the control unit 50 performs a pressing operation. The pressing operation is an operation of pressing the valve 30 having the fully closed opening A0 against the valve seats 22a and 23a. As shown in FIG. 4, when performing the pressing operation, the control unit 50 drives the motor 40 to rotate the valve 30 to the contact opening A2. Further, the control unit 50 drives the motor 40 even after rotating the valve 30 to the contact opening A2, and presses the valve 30 against the valve seats 22a and 23a. According to this, the control part 50 can seal between the upper side seal surface 31a and the lower side seal surface 31b, and the valve seats 22a and 23a, and can improve a shut-off property.

  As shown in FIG. 5, in such a pressing operation, the control unit 50 drives the valve 30 by increasing the duty ratio set to 0 by the closing operation to the default duty ratio D2. The default duty ratio D2 is a preset duty ratio used in the pressing operation. The default duty ratio D2 is set to an appropriate value so that an excessive load is not applied to the valve 30 and the motor 40 during the pressing operation.

  Here, in the closing operation, if phlegm (foreign matter) adheres to the valve seats 22a and 23a, the outer peripheral surface of the valve 30, etc., the valve 30, the right sleeve 22 and the left sleeve immediately before the fully closed opening A0 is reached. There is a case in which the heel bites into the clearance C (see FIG. 2) with 23. As shown in FIG. 5, the control unit 50 tries to rotate the valve 30 with a value close to 0, that is, with a small driving force, immediately before the fully closed opening A0 is reached. For this reason, if a heel bites into the clearance C, there is a possibility that the rotation of the valve 30 is hindered due to insufficient driving force (cannot be rotated to the fully closed opening A0).

  Therefore, as shown in FIG. 6, in the closing operation, the control unit 50 acquires the actual opening degree of the valve 30 (the opening degree detected by the sensor) and opens the target opening degree. The duty ratio is appropriately increased so as to achieve a high degree. As a result, the control unit 50 increases the driving force of the valve 30 when the hook is caught in the clearance C and the valve 30 cannot be rotated, and the valve 30 is rotated to the fully closed opening A0. Yes. In this case, the duty ratio when the fully closed opening A0 is reached (when the closing operation is completed) is a value higher than zero. The graph shown in FIG. 6 schematically shows the relationship between the opening degree of the valve 30 and the duty ratio when the accumulated soot bites into the clearance C. As shown in FIG. 6, the duty ratio when the fully closed opening A0 is reached increases as the soot increases. Hereinafter, such a duty ratio when the fully closed opening A0 is reached is referred to as a “fully closed duty ratio”.

  If the fully closed duty ratio becomes higher than the default duty ratio D2 due to accumulation of soot, if the pressing operation is performed with the default duty ratio D2, the driving force is insufficient and the valve 30 is moved to the valve seats 22a and 23a. There is a possibility that it cannot be pressed against. Therefore, when the fully closed duty ratio is higher than the default duty ratio D2, the control unit 50 performs the pressing operation by driving the valve 30 with the same duty ratio as the fully closed duty ratio.

  For example, as shown in the graph shown by the dotted line in FIG. 6, the control unit 50 accumulates a small amount of soot, and when the fully closed duty ratio becomes the duty ratio D21 higher than the default duty ratio D2, the duty ratio D21 Pressing operation is performed with. Further, as shown in the graph shown by the solid line in FIG. 6, the control unit 50 accumulates soot and when the fully closed duty ratio becomes the duty ratio D22 higher than the duty ratio D21, Pressing operation is performed.

  According to this, when the fully closed duty ratio is higher than the default duty ratio D2, the controller 50 can increase the duty ratio according to the amount of soot. As a result, the control unit 50 can apply a high driving force to the valve 30 during the pressing operation, so that the valve 30 can be pressed against the valve seats 22a and 23a even if soot accumulates in the clearance C. Accordingly, the valve 30 can shear the ridge with the clearance C and crush the ridge between the upper seal surface 31a and the lower seal surface 31b and the valve seats 22a and 23a. According to this, the control part 50 can remove a wrinkle by pressing operation, and can suppress that a wrinkle etc. accumulates.

  Further, as shown in FIG. 7, the control unit 50 performs the pressing operation at the default duty ratio D2 when the fully closed duty ratio is higher than 0 and equal to or less than the default duty ratio D2. As a result, when a small amount of soot is caught in the clearance C, the pressing operation is performed at a duty ratio (default duty ratio D2) equal to or higher than the fully closed duty ratio, and the driving force of the valve 30 during the pressing operation is increased. Secured. As a result, the control unit 50 can increase the shearing force applied to the heel by the clearance C and the pressing force of the valve 30 against the valve seats 22a and 23a, so that the heel can be easily removed. For this reason, the control part 50 can suppress the accumulation of soot effectively.

  As described above, the control unit 50 adjusts the duty ratio during the closing operation according to the fully closed duty ratio, so that the valve 30 during the pressing operation according to the degree of soot accumulation (degree of soot biting). The driving force (the pressing force against the valve seats 22a and 23a) can be adjusted to an appropriate magnitude. According to this, the load applied to the valve seats 22a and 23a and the valve 30 during the pressing operation can be controlled. As a result, the wear of the valve seats 22a and 23a and the valve 30 that occur when removing the soot can be suppressed, and the load on the motor 40 can be suppressed.

  Moreover, the control part 50 can remove a wrinkle by pressing operation. According to this, since it is not necessary to use a phenomenon that occurs in a specific engine state such as pulsation caused by exhaust gas, soot can be removed regardless of the engine state. Moreover, the control part 50 can remove a wrinkle by pressing the valve 30 against the valve seats 22a and 23a without deteriorating the shut-off performance of the flow paths 22b and 23b.

  The control unit 50 performs error processing when the fully closed duty ratio exceeds the operation determination value D0. Specifically, the control unit 50 rotates the valve 30 to the fully open opening A1 as error processing. As a result, the control unit 50 suppresses the soot accumulation and the duty ratio (load of the motor 40) from excessively increasing. The operation determination value D0 is a preset duty ratio used for determining whether or not to perform error processing. A value higher than the default duty ratio D2 is set as the operation determination value D0. The operation determination value D0 according to the present embodiment is set to a value lower than the closing duty ratio D1.

  As described above, the control unit 50 suppresses the accumulation of soot by removing the soot by the pressing operation. As a result, the control unit 50 is less likely to bite the clearance C, so that the fully closed duty ratio can be prevented from increasing. According to this, the control unit 50 can suppress the fully closed duty ratio from exceeding the operation determination value D0. Thereby, the control part 50 can suppress that accumulation of soot advances and performs an error process (rotating the valve | bulb 30 to the full opening degree A1).

  As described above, the valve device 10 according to the present embodiment includes the valve seats 22a and 23a through which the flow paths 22b and 23b are formed, the valve 30 for opening and closing the flow paths 22b and 23b, and the valve 30. A motor 40 (driving unit) that drives the valve 30 and a control operation that controls the motor 40 to control the operation of the valve 30 and operates the valve 30 so as to close the flow paths 22b and 23b. And a control unit 50 capable of executing a pressing operation of pressing the valve 30 against the valve seats 22a and 23a. The control unit 50 drives the valve 30 when the closing operation is performed. The driving force of the valve 30 during the pressing operation is adjusted according to the force.

  By comprising in this way, the load concerning valve seat 22a * 23a and the valve | bulb 30 at the time of pressing operation | movement can be controlled. As a result, it is possible to suppress wear of the valve seats 22a and 23a and the valve 30 that occur when removing foreign matter (soot).

The driving force of the valve 30 when the closing operation is performed is the driving force of the valve 30 at the time when the closing operation is finished.
In the present embodiment, the driving force of the valve 30 at the time when the closing operation is finished indicates the driving force of the valve 30 when the fully closed opening A0 is reached.

  With this configuration, it is possible to simplify the reference for the driving force of the valve 30 when the closing operation is performed. Thereby, the configuration of the valve device 10 can be simplified.

  In addition, when the driving force of the valve 30 at the time when the closing operation is completed is larger than 0, the control unit 50 performs the pressing operation with a driving force equal to or greater than the driving force.

  With this configuration, the pressing operation can be performed with a high driving force. As a result, foreign matters can be easily crushed between the valve seats 22a and 23a and the valve 30, and foreign matters attached to the valve seats 22a and 23a and the valve 30 can be effectively removed.

  The controller 50 performs the pressing operation every time the closing operation is performed.

  By comprising in this way, it can suppress that a foreign material accumulates by performing pushing operation as much as possible.

  The motor 40 is configured to be able to drive the valve 30 by being supplied with electric power, and the driving force of the valve 30 is changed by switching on / off of an applied voltage according to a duty ratio, The controller 50 determines the driving force of the valve 30 when the closing operation is performed based on the duty ratio.

  With this configuration, it is not necessary to detect the torque or the like of the shaft 32. Therefore, it is possible to easily determine the driving force of the valve 30 when the closing operation is performed.

  The valve 30 is constituted by a butterfly valve that opens and closes the flow paths 22b and 23b by rotating.

  By configuring in this way, in the butterfly valve, it is possible to suppress the occurrence of malfunction due to foreign matters attached to the valve seats 22a and 23a and the valve 30.

  The motor 40 according to the present embodiment is an embodiment of the drive unit according to the present invention.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above-described configuration, and various modifications can be made within the scope of the invention described in the claims.

  For example, the valve device 10 is provided in the exhaust control valve, but the application target of the valve device 10 is not limited to this.

  Further, the exhaust gas flows through the flow paths 22b and 23b. However, the fluid flowing through the flow paths 22b and 23b is not limited to the exhaust gas, and may be, for example, compressed air. Good. Moreover, the fluid which distribute | circulates the flow paths 22b * 23b is not limited to gas, For example, liquids, such as water, may be sufficient.

  Further, the valve device 10 is not limited to the butterfly valve device that opens and closes the flow paths 22b and 23b by rotating the valve 30. For example, the valve device 10 reciprocates in the axial direction of the shaft 32. It may be a poppet type valve device.

  Further, the control unit 50 performs the pressing operation with the same duty ratio as the fully closed duty ratio when the fully closed duty ratio is higher than the default duty ratio D2, but the present invention is not limited to this. Absent. When the fully closed duty ratio is higher than the default duty ratio D2, the control unit 50 may perform, for example, a pressing operation with a duty ratio equal to or higher than the fully closed duty ratio. At this time, for example, the control unit 50 may perform the pressing operation at a duty ratio that is higher by a predetermined ratio than the fully closed duty ratio. Further, the control unit 50 may set an upper limit for the duty ratio during the pressing operation (for example, the operation determination value D0 or less may be set). Thereby, the control part 50 can adjust the duty ratio at the time of pushing operation so that it may become a value more than a duty ratio at the time of a full closure by making predetermined value (for example, operation | movement determination value D0) into an upper limit.

  In addition, the control unit 50 performs the pressing operation with the default duty ratio D2 when the fully closed duty ratio is equal to or less than the default duty ratio D2. However, the control unit 50 is not limited to this. The pressing operation may be performed with the same duty ratio as the hour duty ratio. With this configuration, the control unit 50 can reduce the duty ratio of the pressing operation as much as possible and reduce the load on the valve 30 and the motor 40.

  Further, the control unit 50 may change the duty ratio (the driving force of the valve 30) during the pressing operation (for example, gradually increase the driving force from the fully closed opening A0 to the contact opening A2). Good.

  Further, the controller 50 does not necessarily need to perform the pressing operation every time the closing operation is performed. For example, the controller 50 may perform the pressing operation only when the duty ratio at the time when the closing operation is performed exceeds a predetermined threshold. . Thereby, the control part 50 can perform pressing operation only when it is assumed that the foreign material has accumulated.

  As described above, the control unit 50 performs the pressing operation only when the driving force of the valve 30 at the time when the closing operation is finished exceeds a predetermined threshold value.

  With this configuration, the load on the motor 40 can be reduced.

  Moreover, the control part 50 may perform pressing operation, for example, whenever a fixed period passes. In this case, the driving force of the valve 30 during the pressing operation may be adjusted based on the fully closed duty ratio in the most recent closing operation.

  The control unit 50 adjusts the driving force during the pressing operation by setting the duty ratio, but the value for adjusting the driving force is not limited to the duty ratio. May be a current value obtained from the applied voltage and the duty ratio.

  Further, the valve device 10 may control the current value supplied to the motor 40 without using the duty ratio. In this case, the control unit 50 can determine the driving force of the valve 30 based on the current value supplied to the motor 40.

  As described above, the motor 40 is configured to be able to drive the valve 30 by being supplied with electric power, and also changes the driving force of the valve 30 according to the magnitude of the current value, so that the control unit 50 Is for determining the driving force of the valve 30 when the closing operation is performed based on the current value.

  With this configuration, it is not necessary to detect the torque or the like of the shaft 32. Therefore, it is possible to easily determine the driving force of the valve 30 when the closing operation is performed.

  In addition, the control unit 50 acquires the opening degree of the valve 30 from a predetermined sensor. However, the present invention is not limited to this. For example, the control unit 50 opens the valve 30 from an ECU (Engine Control Unit) that controls the engine. You may get the degree.

  Moreover, although the control part 50 shall rotate the valve | bulb 30 to the full opening degree A1 when the duty ratio at the time of full closure exceeds operation determination value D0, the content of the error process is limited to this. It is not a thing. For example, the control unit 50 may perform processing such as stopping the operation of the valve 30, not performing the pressing operation, or outputting an error to another device.

  In this embodiment, the case where the closing operation is performed from the fully opened opening A1 has been described as an example. However, the closing operation is performed from an arbitrary opening between the fully opened opening A1 and the fully closed opening A0. Even in this case, the controller 50 performs the pressing operation after the closing operation.

10 Valve device 22a / 23a Valve seat 22b / 23b Flow path 30 Valve 40 Motor (drive unit)
50 Control unit

Claims (8)

A valve seat having a flow passage formed therethrough;
A valve for opening and closing the flow path;
A drive unit for driving the valve;
The operation of the valve is configured to be controllable by controlling the drive unit, and a closing operation for operating the valve to close the flow path and a pressing operation for pressing the valve against the valve seat are executed. Possible controls,
Comprising
The controller is
Adjusting the driving force of the valve during the pressing operation according to the driving force of the valve when the closing operation is performed;
Valve device. The driving force of the valve when the closing operation is performed is
The driving force of the valve at the time when the closing operation is completed.
The valve device according to claim 1. The controller is
When the driving force of the valve at the time when the closing operation is finished is larger than 0, the pressing operation is performed with a driving force equal to or higher than the driving force.
The valve device according to claim 1 or 2. The controller is
Performing the pressing operation every time the closing operation is performed,
The valve device according to any one of claims 1 to 3. The controller is
The pressing operation is performed only when the driving force of the valve at the time when the closing operation ends exceeds a predetermined threshold.
The valve device according to any one of claims 1 to 3. The drive unit is
While being configured to be able to drive the valve by supplying electric power, the driving force of the valve is changed by switching on / off of the applied voltage according to the duty ratio,
The controller is
Determining the driving force of the valve when the closing operation is performed according to the duty ratio;
The valve device according to any one of claims 1 to 5. The drive unit is
While being configured to be able to drive the valve by supplying electric power, the driving force of the valve is changed according to the magnitude of the current value,
The controller is
Determining the driving force of the valve when the closing operation is performed according to the current value;
The valve device according to any one of claims 1 to 5. The valve is
It is constituted by a butterfly valve that opens and closes the flow path by rotating,
The valve device according to any one of claims 1 to 7.

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