JP2012013179A - Valve control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a magnetic flux of a magnetic field from leaking to the surrounding area, wherein the magnetic flux of the magnetic field is emitted from a magnetic moving body, particularly, a magnet, and thereby, to prevent decrease in the quantity of a magnetic flux (magnetic flux density) of a magnetic field applied to a magnetism-sensing surface of a stroke sensor.SOLUTION: A waste gate valve control device includes a male-side connector housing 8 disposed in a projection part, which is perpendicular to a magnetism sensitive surface F of a Hall element of a stroke sensor S and is defined by projecting a region enclosed by the visible outline of a magnetic moving body 7 in a direction perpendicular to the region, wherein the male-side connector housing 8 prevents layout of an external magnetic body, an external magnet or the like that gives magnetic obstacles on the stroke sensor S. A magnetic circuit (comprising the magnetic moving body 7 and the stroke sensor S) is disposed within a range defined by projecting the region enclosed by the visible outline of the male-side connector housing 8 in a direction perpendicular to the region. Thereby, an external magnetic body, an external magnet or the like is prevented from being disposed around (near) the magnetic circuit.

Description

  The present invention relates to a valve control device including a stroke detection device that detects a stroke amount of an actuator rod, and more particularly, to a stroke detection device that detects a stroke amount of an actuator rod that drives a waste gate valve of an internal combustion engine. Related to the waste gate valve control device.

[Conventional technology]
2. Description of the Related Art Conventionally, a throttle valve installed in an intake pipe of an internal combustion engine (engine), an actuator that drives a shaft that supports the throttle valve, and a magnetic sensor (in particular, a Hall element) that detects the position of the shaft are provided. 2. Description of the Related Art A throttle valve control device including a throttle opening degree detection device that detects the opening degree of a throttle valve based on a sensor output signal output from an element is known (for example, see Patent Document 1).
In this throttle opening detection device, as shown in FIG. 11, a rotor 103 is rotatably installed in an internal space formed by two first and second housings 101 and 102.
The rotor 103 includes a shaft 104 that supports the throttle valve, and a magnet structure disposed in the first space.

The magnet structure includes a permanent magnet 105 disposed coaxially with the rotation axis of the rotor 103, a pair of yokes 106 and 107 fixed to the permanent magnet 105 so as to be integrally rotatable, and the yokes 106 and 107 are made permanent. The connecting portion 108 is fixed to the magnet 105. The second housing 102 is positioned between the cover 109 covering the inside of the first housing 101, the connector housing 111 provided with a plurality of terminals 110, and the magnetic pole surfaces of the pair of yokes 106 and 107. And a substrate portion 113 on which a Hall element 112 and the like are mounted.
In the throttle opening detection device described in Patent Document 1, the magnetic flux generated from the permanent magnet 105 passes through the inside of the yoke 106 or the yoke 107, and is installed between the magnetic pole surfaces of the pair of yokes 106 and 107. 112 is configured to detect the magnetic flux.

[Conventional technical problems]
However, in the throttle opening degree detection device described in Patent Document 1, when the permanent magnet 105 is arranged in a vertical direction perpendicular to the magnetic sensing surface of the Hall element 112 or perpendicular to the drawing, The magnetic field between the pair of yokes 106 and 107 is disturbed by the external magnetic field generated from the permanent magnet 105. As a result, a magnetic flux corresponding to the position of the shaft 104 cannot be obtained, which causes a problem that the detection accuracy by the Hall element 112 deteriorates.

  In addition, when an external magnetic body that gives a magnetic obstruction (magnetic noise) to the Hall element 112 is disposed on the outer periphery of the pair of yokes 106 and 107, the magnetic field generated from the permanent magnet 105 is disturbed, The magnetic flux of the permanent magnet 105 leaks to the surroundings (external magnetic body). As a result, the density of magnetic flux passing through the Hall element 112 becomes weak, which causes a problem that the detection accuracy by the Hall element 112 decreases.

JP 2000-74613 A

  An object of the present invention is to reduce the amount of magnetic flux (magnetic flux density) of the magnetic field applied to the magnetically sensitive surface of the sensor by suppressing leakage of magnetic flux emitted from the magnetic moving body, particularly the magnet, to the surroundings. It is an object of the present invention to provide a valve control device that can prevent this from occurring. In addition, a valve control device that can improve the detection accuracy of the sensor by making the magnetic sensing surface of the sensor less susceptible to magnetic noise from external components (external magnetic body, external magnet, etc.). It is to provide.

According to the first aspect of the present invention, there is provided an actuator for reciprocating a rod for driving the valve in the axial direction thereof, and an amount of movement of the actuator in the axial direction of the rod (the amount of movement in the stroke direction which is the same direction as the rod: rod Stroke detecting means for detecting the stroke amount).
The stroke detection means includes a magnetic moving body including a magnet that generates a magnetic field having a constant magnetic flux density, and a sensor that detects a magnetic flux that changes as the magnetic moving body moves.
The magnetic moving body is integrally installed on the rod. Thus, when the rod moves in the axial direction, the magnetic moving body also moves in the direction parallel to or in the same direction as the axial direction of the rod by the same amount of movement as the rod.
The magnetic sensing surface of the sensor is a part that senses magnetic flux (density, magnetic field strength) applied from a magnetic moving body, particularly a magnet.
The actuator is provided with an obstacle for preventing the placement of an external component (external magnetic body, external magnet, etc.) that gives a magnetic obstacle to the sensor. The obstacle is formed of a nonmagnetic material that is installed in a perpendicular direction perpendicular to the magnetic sensing surface of the sensor and hardly gives a magnetic obstacle to the sensor.

According to the first aspect of the present invention, an obstacle formed of a nonmagnetic material (nonmagnetic material) is installed in a perpendicular direction perpendicular to the magnetic sensitive surface of the sensor. It is prevented that an external component that gives a magnetic obstacle to the sensor is arranged around (near) the magnetic circuit configured by the above. Thereby, it is possible to prevent the magnetic flux emitted from the magnetic mobile body, particularly the magnet, from leaking to the surroundings and reducing the amount of magnetic flux (magnetic flux density) applied to the magnetic sensitive surface of the sensor.
In addition, by installing an obstacle made of non-magnetic material in a direction perpendicular to the sensor's magnetosensitive surface, even if external parts are placed around the obstacle, the magnetic movement It is possible to ensure a sufficient distance between the magnetic circuit composed of the body, the sensor, and the like and the external component so as not to be affected by magnetic noise or a disturbance magnetic field.
This makes it difficult for the magnetic circuit, particularly the sensor, to be affected by magnetic noise and disturbance magnetic fields from external components on the sensor, so that the influence of the magnetic field disturbance around the sensor is minimized. Therefore, the detection accuracy by the sensor, that is, the detection accuracy of the stroke amount of the rod can be improved.

According to the second aspect of the present invention, the obstacle is provided on the projection unit obtained by projecting the area (planar outer area) surrounded by the outline of the magnetic moving body in the vertical direction of the area, thereby providing the magnetic moving body. In addition, an external component that gives a magnetic obstacle to the sensor is prevented from being arranged around the magnetic circuit including the sensor and the like.
In addition, when external parts are placed around the obstacle by installing the obstacle on the projection unit that projects the area surrounded by the outline of the magnetic moving body (planar outer area) in the vertical direction of this area Even so, it is possible to secure a sufficient distance between the magnetic circuit constituted by the magnetic moving body and the sensor and the external component so as not to be affected by the magnetic noise and the disturbance magnetic field.

According to the third aspect of the present invention, since the obstacle is installed over the entire area (area) in which the magnetic movable body can move in accordance with the movement of the actuator rod in the axial direction, the magnetic movement The influence of disturbance due to external parts can be reduced with respect to the range (area) in which the body can move.
According to the fourth aspect of the present invention, the actuator is provided with the rod bearing that supports the rod slidably in the axial direction while allowing the shaft to swing. Then, the entire range (area) in which the rod of the actuator can swing with the opening and closing operation of the valve, that is, the entire range (area) in which the magnetic movable body can swing with the shaft swing of the rod is covered. Since the obstacles are installed, the external parts cannot be arranged in the rod shaft deflection direction in addition to the non-placement of the external parts in the rod stroke direction which is the same as the rod axis direction. Thereby, the further improvement of the detection accuracy by a sensor can be expected.

According to the fifth aspect of the present invention, since the functional parts constituting the actuator are arranged on the opposite side to the obstacle side with respect to the center line in the rod axial direction, external parts are arranged around the obstacle. Even in the case of being arranged, a sufficient distance can be ensured between the magnetic circuit constituted by the magnetic moving body and the sensor and the external part so as not to be affected by magnetic noise and disturbance magnetic field.
According to the sixth aspect of the present invention, each functional component constituting the actuator is made of a non-magnetic material (non-magnetic material) that hardly gives a magnetic obstacle to the sensor. That is, no magnetic noise or disturbance magnetic field is generated for a magnetic circuit composed of a magnetic moving body and a sensor.

According to the seventh aspect of the present invention, a pair of male and female connector housings that can be fitted to each other is provided.
A cylindrical hood portion extending from the sensor toward the outside is provided on the male connector housing of the pair of male and female connector housings. Moreover, the cylindrical connector cylinder part which fits the outer side of the food | hood part of the male connector housing is provided in the female connector housing of a pair of male and female connector housings.
According to the eighth aspect of the present invention, the obstacle is a male connector housing having a cylindrical hood portion that fits inside the fitting cylindrical portion of the female connector housing.
A magnetic circuit constituted by a magnetic movable body, a sensor, and the like within a range (area) projected in the vertical direction of this region (planar outer area) surrounded by the outer line of the hood portion of the male connector housing Because of the installation, external parts cannot be arranged even within the physique range of the hood portion of the male connector housing.

According to the ninth aspect of the present invention, the obstacle means a female connector housing having a cylindrical fitting tube portion that fits outside the hood portion of the male connector housing.
The region surrounded by the outline of the fitting tube portion of the female connector housing (planar outer area) is configured by a magnetic movable body, a sensor, and the like within a range (area) projected in the vertical direction of this region. When the magnetic circuit is installed so that the magnetic circuit composed of the magnetic moving body and the sensor cannot be covered only by the physique of the male connector housing, or the magnetic circuit composed of the magnetic moving body and the sensor Even when the male connector housing is arranged shifted from the center of the external connector, the external parts cannot be arranged even within the physique range of the fitting cylinder portion of the female connector housing.

According to the tenth aspect of the present invention, the obstacle refers to a female connector housing having a cylindrical fitting tube portion that fits outside the hood portion of the male connector housing.
Then, an area (planar outer area) obtained by adding a work space for connecting the male and female connector housings to the area surrounded by the outline of the fitting cylinder portion of the female connector housing is projected in the vertical direction of this area. If a magnetic circuit composed of a magnetic movable body and a sensor is installed in the range (area), the magnetic movable body and the sensor cannot be covered only by the physique of the fitting cylindrical portion of the female connector housing, or the magnetic circuit Even when a pair of male and female connector housings are connected by shifting from the center of a magnetic circuit composed of a moving body, a sensor, etc., the physique range of the fitting tube portion of the female connector housing and the male and female connector housings External parts cannot be arranged even within a range including the work space to be connected.

According to the eleventh aspect of the present invention, the actuator includes a reduction mechanism that decelerates the rotation of the motor that is a power source, and a conversion mechanism that converts the rotational movement of the reduction mechanism into a linear movement of the rod. It is a feature.
According to a twelfth aspect of the present invention, the speed reduction mechanism has a drive gear that is rotationally driven by a motor and a driven gear that meshes with the drive gear and rotates. According to the thirteenth aspect of the present invention, the conversion mechanism has a cam groove having a shape corresponding to the operation pattern of the valve, the cam rotating in accordance with the rotation of the speed reduction mechanism (the driven gear), and the cam And a follower that is movably inserted into the cam groove. Further, the rod has a support shaft that rotatably supports the follower, and one end side is connected to the cam via the follower and the support shaft, and the other end side is connected to the valve.

It is explanatory drawing which showed the waste gate valve control apparatus (Example 1). (Example 1) which is the sectional view which showed the positional relationship of a stroke sensor (Hall IC) and a male connector housing (obstacle). It is explanatory drawing which showed the waste gate valve control apparatus (Example 1). (Example 1) which is the sectional view which showed the positional relationship of a stroke sensor (Hall IC) and a male connector housing (obstacle). (Example 1) which was the side view which showed the example which mounted | wore the sensor cover with the male connector housing. (Example 2) which is the sectional view which showed the positional relationship of a stroke sensor (Hall IC) and a male connector housing (obstacle). (Example 3) which was the side view which showed the example which installed the connector housing of the male side on the axial runout range of a rod. (Example 4) which was the side view which showed the example which has arrange | positioned the magnetic moving body in the physique range of the female connector housing. (Example 5) which is the side view which showed the example which has arrange | positioned the magnetic moving body in the assembly | attachment work range of the female connector housing. (Example 6) which was the side view which showed the example which has arrange | positioned the magnetic moving body in the assembly | attachment work range of the female side connector housing. It is sectional drawing which showed the throttle opening detection apparatus (conventional technique).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The present invention aims to prevent a decrease in the amount of magnetic flux (magnetic flux density) of the magnetic field applied to the magnetosensitive surface of the sensor, and magnetic flux emitted from the magnetic mobile body, particularly the magnet, leaks to the surroundings. This was achieved by suppressing this. The purpose of improving detection accuracy by the sensor is realized by making the magnetically sensitive surface of the sensor less susceptible to magnetic noise from external components (external magnetic material, external magnet, etc.).
More specifically, a region (planar outer area) that is perpendicular to the magnetic sensing surface of the sensor and surrounded by the outline of the magnetic moving body is projected onto the projection unit that is projected in the vertical direction of the region. This was realized by installing an obstacle formed of a magnetic material (for example, a connector housing or protruding rib protruding outward from the outer wall surface of the case).
This prevents the arrangement of external parts (external magnetic body, external magnet, etc.) that give magnetic disturbance to the sensor. Even when external parts (external magnetic bodies, external magnets, etc.) are placed around obstacles, magnetic circuits and external parts (external magnetic bodies, external magnets) composed of magnetic moving bodies and sensors, etc. Etc.), a sufficient distance can be secured so as not to be affected by magnetic noise and disturbance magnetic field.

[Configuration of Example 1]
FIGS. 1 to 5 show a first embodiment of the present invention. FIGS. 1 and 3 show a waste gate valve control device. FIGS. 2 and 4 show a stroke sensor, a male connector housing, FIG. 5 is a diagram showing an example in which the male connector housing is attached to the sensor cover.

  The waste gate valve control device for an internal combustion engine according to the present embodiment is a system used as a supercharging pressure control device for an internal combustion engine. The waste gate valve 1 opens and closes a waste gate flow path of a turbocharger, and the waste gate. Based on a link mechanism such as a link lever 3 connected to the shaft 2 of the valve 1, an electric actuator having a rod 4 drivingly connected to the wastegate valve 1 via the link lever 3, and an operating state of the internal combustion engine (engine) An engine control unit (ECU) that performs open / close control of the waste gate valve 1 to variably control the supercharging pressure of the engine is provided.

The waste gate valve 1 is a valve body of an exhaust gas flow rate control valve that controls the flow rate of exhaust gas flowing through the waste gate flow path of a turbocharger mounted on the engine. The waste gate valve 1 is rotated in the valve operation range from the fully closed position to the fully open position of the waste gate valve 1 based on a control signal from the ECU when the engine is operated. The opening area (exhaust gas distribution area) is changed.
An L-shaped shaft 2 is integrally provided on the rear surface of the waste gate valve 1 (partition wall: the end surface opposite to the seating surface seated on the valve seat).
Details of the waste gate valve 1 will be described later.

The electric actuator performs opening / closing control of the waste gate valve 1 in accordance with the amount of movement of the rod 4 in the stroke direction (rod axis direction) (the stroke amount of the rod 4).
In addition to the rod 4 reciprocating in the stroke direction (axial direction), the electric actuator allows the rod 4 to slide in the reciprocating movement direction (the stroke direction of the rod 4) while allowing the rod 4 to swing (shaking). A rod bearing (thrust bearing) 5 that is movably supported, and a coil spring 6 that generates a biasing force (spring load) for biasing the waste gate valve 1 toward the closing side (valve full closing side) of the rod 4. And an actuator case for housing components such as the thrust bearing 5 and the coil spring 6. Here, the rod 4 of the electric actuator has a distal end side in the stroke direction protruding from the annular end surface of the actuator case to the outside of the actuator case.
The details of the electric actuator will be described later.

As the engine, a multi-cylinder diesel engine having a plurality of cylinders is employed. An intake pipe through which intake air flows is connected to a plurality of intake ports (for each cylinder) of the engine. A turbocharger compressor, an intercooler, a throttle valve, an intake manifold, and the like are installed in the middle of the intake pipe.
An exhaust pipe through which exhaust gas flows is connected to a plurality of exhaust ports (for each cylinder) of the engine. In the middle of the exhaust pipe, an exhaust manifold, a turbocharger turbine, and the like are installed.

The turbocharger is a turbocharger that includes a turbine and a compressor, compresses intake air by the compressor, and sends the compressed air to a combustion chamber for each cylinder of the engine.
The turbine includes a spiral turbine housing. A turbine impeller (turbine wheel) is installed in the turbine housing.
The compressor includes a spiral compressor housing. A compressor impeller (compressor wheel) is installed in the compressor housing. Further, the turbine impeller and the compressor impeller are coupled so as to rotate together by a rotor shaft.
In the turbocharger, when the turbine impeller is rotationally driven by the exhaust gas, the compressor impeller also rotates, and the compressor impeller compresses the intake air.

Here, the wastegate flow path and the wastegate valve 1 are provided in the turbine housing of the turbocharger of the present embodiment.
The waste gate flow path is a bypass passage (fluid) for allowing the exhaust gas introduced into the turbine housing not to pass through the turbine impeller, that is, to bypass the turbine impeller and flow to the exhaust passage downstream of the turbine impeller. Passage).
Alternatively, the waste gate flow path branches the exhaust gas flowing out from the engine from the downstream side of the exhaust manifold assembly, and joins the exhaust passage downstream of the turbocharger turbine in the exhaust gas flow direction. It is a bypass passage (fluid passage) for bypassing exhaust gas from the turbine housing.

The waste gate flow path of the present embodiment communicates the upstream communication hole (waist gate port) opened at the partition wall at the inlet of the turbine housing and the downstream communication hole opened at the partition wall at the outlet of the turbine housing.
The waste gate valve 1 is formed in a disk shape with a metal material such as stainless steel. The waste gate valve 1 is connected to the stroke direction tip of the rod 4 of the electric actuator, and is seated and separated from the partition wall (valve seat) at the inlet of the turbine housing, so that a waste gate flow path, particularly a waste gate valve, is provided. This is an exhaust gas control valve that opens and closes the gate port. Further, the waste gate valve 1 rotates about the rotation center axis, thereby changing the opening area of the waste gate flow path, particularly the waste gate port, continuously or stepwise.

Between the shaft 2 of the waste gate valve 1 and the rod 4 of the electric actuator, a link mechanism for converting the linear motion of the rod 4 of the electric actuator into the rotational motion of the waste gate valve 1 is installed.
As shown in FIGS. 1, 3, and 5, the link mechanism has one end connected to the distal end side in the stroke direction (reciprocating direction) of the rod 4 of the electric actuator and the other end of the waste gate valve 1. It has a link lever 3 connected to the tip side of the shaft 2 (the side opposite to the valve side).
Here, a first hinge pin (first support shaft) 11 that is driven from the back surface side of the rod 4 and protrudes to the front surface side is fixed (or integrally formed) to the tip end side in the stroke direction of the rod 4. . A second hinge pin (second support shaft) 12 protruding in the same direction as the protruding direction of the first hinge pin 11 is integrally formed (or fixed) on the shaft 2 of the waste gate valve 1.

As shown in FIG. 1, the link lever 3 has a rotation axis (rotation center of the link lever 3) on the same axis as the rotation center axis of the waste gate valve 1 and is coupled to the rod 4. And a second coupling portion coupled to the shaft 2 of the waste gate valve 1. A first fitting hole having a circular cross section into which the first hinge pin 11 is fitted is formed in the first coupling portion. The second coupling portion is formed with a second fitting hole having a circular cross section into which the second hinge pin 12 is fitted.
Here, the first coupling portion of the link lever 3 is a curve having a predetermined radius of curvature around the rotation axis of the link lever 3 when the wastegate valve 1 rotates between the fully closed position and the fully open position. It is a coupling part (center of coupling part, coupling point) that moves on the rotational actuation line (rotation actuation line of the link lever 3: the one-dot chain line in the figure).

  The rotation operation line of the link lever 3 is defined as a rotation operation point on the rotation operation line of the link lever 3 at which the waste gate valve 1 is fully closed, and a waste operation point on the rotation operation line of the link lever 3. When the rotation operation point on the rotation operation line of the link lever 3 at which the gate valve 1 is fully opened is the full opening point on the rotation operation line of the link lever 3, the fully closed point on the rotation operation line of the link lever 3 and the link lever 3 is a circular locus obtained by connecting the fully open points on the rotational operation line 3 with a curve of a predetermined radius of curvature centering on the rotation center axis of the waste gate valve 1 (rotation axis of the link lever 3).

The link lever 3 is rotatably supported on the outer periphery of the first hinge pin 11. The link lever 3 is fixed to the second hinge pin 12.
The first hinge pin 11 rotatably supports the waste gate valve 1, the shaft 2, the link lever 3, and the like.
The 2nd hinge pin 12 is being fixed to the electric actuator side edge part of the shaft 2 bent at right angle in the middle. The second hinge pin 12 is rotatably supported on the side wall portion of the turbine housing of the turbocharger. The center of the second hinge pin 12 is the center of rotation of the waste gate valve 1.
As described above, the waste gate valve 1 constitutes a hinge valve connected to the distal end side of the rod 4 in the stroke direction via the first hinge pin 11, the link lever 3, and the second hinge pin 12.

Next, details of the electric actuator of this embodiment will be described with reference to FIGS.
The electric actuator includes, in addition to the rod 4, the thrust bearing 5 and the coil spring 6, an electric motor M that receives a supply of electric power and generates a driving force (motor torque), and a deceleration that decelerates the rotation of the electric motor M by two stages. A mechanism, a conversion mechanism that converts the rotational motion of the speed reduction mechanism into a reciprocating linear motion, a stroke amount detection device (magnetic moving body 7, stroke sensor S) that detects the stroke position of the rod 4 of the electric actuator, And an actuator case for housing the component parts.
Here, a pair of male and female connector housings 8 and 9 that can be fitted to each other are integrally installed in the actuator case of the electric actuator of this embodiment (see FIGS. 8 to 10).

The reduction mechanism is composed of three reduction gears. The speed reduction mechanism includes a motor shaft (rotary shaft, output shaft) 13 of the electric motor M, two first and second support shafts (intermediate gear shaft, final gear shaft) 14 arranged in parallel to the motor shaft 13, 15, a pinion gear (motor gear) 16 fixed to the motor shaft 13, an intermediate gear (drive gear, first gear) 17 that rotates in mesh with the pinion gear 16, and a final gear (driven gear) that rotates in mesh with the intermediate gear 17 , Second gear, spur gear) 18 and the like.
The conversion mechanism includes a rotating plate cam 21, a follower 23 that is movably inserted into the cam groove 22 of the plate cam 21, a pivot pin 24 that rotatably supports the follower 23, and the like.

Here, the actuator case of the electric actuator includes a motor housing 25 that accommodates and holds the electric motor M, a gear housing 26 that rotatably accommodates the speed reduction mechanism and the conversion mechanism, and a sensor cover that closes the opening of the gear housing 26 ( Lid) 27.
The motor housing 25 and the gear housing 26 are made of a nonmagnetic material such as stainless steel. The sensor cover 27 is made of a nonmagnetic material such as a resin material having excellent electrical insulation.

Here, a bearing hole penetrating in the axial direction of the rod 4 is formed in the cylindrical bearing holder 28 positioned on the valve side from the side wall of the gear housing 26. A thrust bearing 5 is press-fitted into the hole wall surface of the bearing hole. A coil spring 6 is housed in a cylindrical spring holder 29 that protrudes from the side wall of the gear housing 26 toward the valve side.
The details of the actuator case of the electric actuator, particularly the pair of male and female connector housings 8 and 9, will be described later.

  The rod 4 of the electric actuator extends straight in the stroke direction (rod axis direction) which is the same as the axial direction. The rod 4 includes a first rod 31 in the form of a plate (flat plate) connected (connected) to the plate cam 21 via a follower 23 and a pivot pin 24, and a waste gate via a link mechanism (link lever 3 or the like). A plate (flat plate) -like second rod 32 connected (connected) to the shaft 2 of the valve 1 and a connecting rod 33 having a circular cross-section connecting the first rod 31 and the second rod 32 are configured. In addition, the 1st rod 31, the 2nd rod 32, and the connecting rod 33 are formed, for example with metal materials (nonmagnetic body), such as stainless steel, and are connected by welding etc., and become an integral component.

The first rod 31 is an input unit that receives a load from the plate cam 21 via the follower 23 and the pivot pin 24. The surface of the first rod 31 is a magnetic moving body mounting surface for fixing the magnetic moving body 7 with screws. The magnetic moving body 7 may be fixed to the first rod 31 by resin molding.
A fitting hole 34 into which the pivot pin 24 is fitted is formed at one end of the first rod 31 (the end opposite to the connecting rod 33 side). The pivot pin 24 is driven from the back surface side of the first rod 31 and protrudes to the front surface side and is connected (fixed) to the first rod 31.
The other end of the first rod 31 is provided with a first connecting portion 35 that is connected to one end in the axial direction of the connecting rod 33 by welding.

The second rod 32 is an output unit that applies a load to the waste gate valve 1 via the link lever 3 and the first and second hinge pins 11 and 12. A second connecting portion 36 that is connected to the other end side in the axial direction of the connecting rod 33 by welding is provided at one end portion (the end portion on the connecting rod 33 side) of the second rod 32.
A fitting hole (not shown) into which the first hinge pin 11 is fitted is formed at the other end of the second rod 32 (the end opposite to the connecting rod 33 side). The first hinge pin 11 is driven from the back side of the second rod 32, protrudes to the front side, and is connected (fixed) to the second rod 32.

  The connecting rod 33 is a relay part that connects the first connecting part 35 of the first rod 31 and the second connecting part 36 of the second rod 32. On the outer periphery of the end of the connecting rod 33 on the first rod 31 side is an annular shape (saddle shape, flange shape) that is a load receiving portion that receives a load urging from the coil spring 6 toward the valve fully closed side in the stroke direction. A spring seat 37 is attached. The connecting rod 33 is supported so as to be swingable about the bearing center of the thrust bearing 5 and slidable in the axial direction of the thrust bearing 5. The spring seat 37 is locked to the end surface of the first connecting portion 35 of the first rod 31.

  The thrust bearing 5 supports the connecting rod 33 slidably in its stroke direction (rod axis direction). A through hole (sliding hole) penetrating in the axial direction of the rod 4 is formed in the thrust bearing 5. Further, the inner peripheral surface of the thrust bearing 5 (sliding surface that slides with the connecting rod 33) is a convex curved surface that protrudes most toward the rod axis center line side in the vicinity of the bearing center of the thrust bearing 5. As a result, the connecting rod 33 is allowed to swing (shaking).

The coil spring 6 is a rod (valve) urging means that generates an urging force (load) that urges the rod 4 toward the side where the waste gate valve 1 is closed (the valve is fully closed in the stroke direction). One end of the coil spring 6 is held by a spring seat 37, and the other end of the coil spring 6 is held by an annular partition wall (closing wall) 38 that connects the end of the bearing holder 28 and the spring holder 29. Yes.
As a result, the spring load from the coil spring 6 (the load urging the valve fully closed) acts on the rod 4 of the electric actuator, particularly the first rod 31.

The speed reduction mechanism constitutes a power transmission mechanism that transmits the torque of the electric motor M to the conversion mechanism. As described above, the speed reduction mechanism includes the intermediate gear shaft 14, the final gear shaft 15, the pinion gear 16, the intermediate gear 17, the final gear 18, and the like.
The intermediate gear shaft 14 and the final gear shaft 15 are arranged in parallel with each other. Further, the three gears 16 to 18 are housed rotatably in the reduction gear housing space of the gear housing 26.

The intermediate gear shaft 14 is driven into a fitting hole of the gear housing 26 and is press-fitted and fixed to a fitting portion of the gear housing 26. The axial center line of the intermediate gear shaft 14 constitutes the rotation center of the intermediate gear 17. An intermediate gear 17 is rotatably supported on the outer periphery of the intermediate gear shaft 14 via two bearings (bearings: not shown). Two bearings may not be provided.
An annular circumferential groove is formed on the outer periphery of the protruding portion protruding from the end face of the intermediate gear 17 of the intermediate gear shaft 14. In this circumferential groove, intermediate gear retaining means such as a washer and a C-ring that prevent the intermediate gear 17 from coming off from the intermediate gear shaft 14 when the intermediate gear 17 is fitted to the outer periphery of the intermediate gear shaft 14. It is installed.

The final gear shaft 15 is driven into the fitting hole 41 of the gear housing 26 and is press-fitted and fixed to the cylindrical fitting portion 42. The axial center line of the final gear shaft 15 constitutes the rotation center of the final gear 18. Further, the final gear 18 is rotatably supported on the outer periphery of the final gear shaft 15 via two bearings (bearings) 43. The two bearings 43 may not be provided.
Further, an annular circumferential groove is formed on the outer periphery of the protruding portion that protrudes from the end face of the final gear 18 of the final gear shaft 15. In the circumferential groove, there is a final gear retaining means such as a washer and a C-ring for preventing the final gear 18 from coming off from the final gear shaft 15 when the final gear 18 is fitted to the outer periphery of the final gear shaft 15. It is installed.

The pinion gear 16 is made of a metal material or a resin material. The pinion gear 16 is press-fitted and fixed to the outer periphery of the motor shaft 13. On the outer periphery of the pinion gear 16, a plurality of convex teeth (pinion gear portions) 44 that mesh with the intermediate gear 17 are formed in the entire circumferential direction.
The intermediate gear 17 is formed of a metal material or a resin material, and is rotatably fitted to the outer periphery of the intermediate gear shaft 14. The intermediate gear 17 has a cylindrical portion installed so as to surround the periphery of the intermediate gear shaft 14 in the circumferential direction. An annular maximum outer diameter portion (large diameter portion) is integrally formed on the outer periphery of the cylindrical portion.

On the outer periphery of the large-diameter portion of the intermediate gear 17, a plurality of convex teeth (large-diameter gear portions) 45 that mesh with the convex teeth 44 of the pinion gear 16 are formed in the entire circumferential direction. A plurality of convex teeth (small diameter gear portions) 46 that mesh with the final gear 18 are formed on the entire circumference in the outer periphery of the cylindrical portion (small diameter portion).
The final gear 18 is formed of a metal material or a resin material, and is rotatably fitted to the outer periphery of the final gear shaft 15 via two bearings 43. The final gear 18 has a cylindrical portion installed so as to surround the periphery of the final gear shaft 15 in the circumferential direction. The cylindrical portion has a flange 47 that extends in a fan shape from the outer peripheral surface of the cylindrical portion.
On the outer peripheral portion of the flange 47 of the final gear 18, a plurality of convex teeth (fan-shaped large-diameter gear portions) 48 that mesh with the convex teeth 46 of the intermediate gear 17 are formed in a fan shape by a predetermined angle.

  The conversion mechanism is a movement direction conversion mechanism that converts the rotational movement of the final gear 18 into the linear movement of the rod 4. The conversion mechanism includes a plate cam 21 that rotates integrally with the final gear 18 around the final gear shaft 15 of the final gear 18, a follower 23 that is movably inserted into the cam groove 22 of the plate cam 21, and A pivot pin 24 or the like that rotatably supports the follower 23 is configured.

The plate cam 21 is formed in a predetermined shape from a metal material, and is fixed to the cam mounting portion of the final gear 18. When the final gear 18 is made of a resin material, the plate cam 21 is insert-molded into the final gear 18. Further, when the final gear 18 is formed of a metal material, the final gear 18 and the plate cam 21 may be integrated with sintered metal or the like. With this configuration, since the rotation shaft of the final gear 18 and the rotation shaft of the plate cam 21 are made common, the rotation center of the final gear 18 (rotation center of the final gear shaft 15) and the rotation of the plate cam 21 are shared. The center matches. Further, the operating angle of the final gear 18 (final gear operating angle) is equal to the rotational angle of the plate cam 21 (cam rotational angle).
The cam groove 22 of the plate cam 21 is a curved guide portion corresponding to the operation pattern of the waste gate valve 1.
Here, the cam shape of the plate cam 21 and the rotation angle of the plate cam 21 are determined with respect to the amount of rod stroke required to drive the waste gate valve 1 from the fully closed position to the fully open position.

The follower 23 is formed in a cylindrical shape from a metal material, and is rotatably fitted to the outer periphery of the pivot pin 24. The follower 23 has a cylindrical portion so as to surround the periphery of the pivot pin 24 in the circumferential direction.
The pivot pin 24 is driven into the fitting hole 34 of the rod 4 and is press-fitted and fixed to the rod 4. In addition, a flange that is crushed and caulked in order to prevent the follower 23 from coming off is formed on the protruding portion that protrudes from the end surface of the cylindrical portion of the follower 23 of the pivot pin 24.
Further, the rotation center of the follower 23 is set on the center line in the stroke direction of the rod 4, that is, on the rod axis center line, together with the rotation center of the plate cam 21.

The electric motor M is a power source of the electric actuator and is housed and held in the motor housing space of the motor housing 25. The electric motor M is configured to be energized and controlled by the ECU.
The ECU is provided with a microcomputer having a known structure that includes functions of a CPU, a ROM, a RAM, and the like. Then, the ECU performs an electric actuator for the throttle valve, a waste gate based on sensor output signals of various sensors such as a stroke sensor S, a crank angle sensor, an accelerator opening sensor, a throttle opening sensor, a boost pressure sensor, and a vehicle speed sensor. The electric actuator of the valve 1 is controlled.

Next, details of the stroke amount detection device of the present embodiment will be briefly described with reference to FIGS.
The stroke amount detection device includes a magnetic moving body 7 that is integrally installed on the rod 4 and a stroke sensor S that detects the stroke position of the magnetic moving body 7.
The ECU has a function as rod stroke detecting means for calculating (detecting) the linear stroke position of the rod 4 of the electric actuator based on the output value (sensor output value) output from the stroke sensor S. ing.

The magnetic moving body 7 is integrally installed (fastened and integrated) on the rod 4 so as to be linearly displaced (moved) with the movement of the rod 4 as a detection target in the stroke direction. The magnetic moving body 7 includes two first and second magnets (magnets) 51 and 52 that generate a magnetic field having a constant magnetic flux density in parallel, and magnetic flux (magnetic field) emitted from the magnetic pole surfaces of these magnets 51 and 52. ) Is concentrated on the stroke sensor S, and is formed of a rectangular frame-like magnetic frame (magnetic body) or the like.
The two magnets 51 and 52 are formed in a rectangular parallelepiped shape and are permanent magnets that emit a magnetic flux (magnetic field) toward the stroke sensor S. These magnets 51 and 52 are N-pole and S-pole magnetized so that the opposite ends of the plate thickness direction orthogonal to the plate length direction and the plate width direction are opposite to each other. . The two magnets 51 and 52 are magnetized in parallel so that the directions of the magnetic lines of force inside the magnets are parallel to each other. Moreover, the two magnets 51 and 52 are arrange | positioned facing the predetermined air gap.

The two magnets 51 and 52 are magnetized in the vertical direction orthogonal to the rod axis center line. Further, the two magnets 51 and 52 are magnetized so that the magnetic pole faces facing each other have the same polarity (for example, N pole). The arrows shown in FIG. 1 indicate the direction of magnetic flux lines (magnetic field direction) emitted from the magnetic pole surfaces of the two magnets 51 and 52.
Thereby, the magnetizing direction (plate thickness direction) of the magnet 51 coincides with the vertical direction orthogonal to the rod axis center line, and one side of the magnet 51 in the plate thickness direction (the upper side in the drawing in FIG. 1). The magnetic pole surface on the other side in the plate thickness direction of the magnet 51 (the lower side in the drawing in FIG. 1) is the N pole. Further, the magnetizing direction (plate thickness direction) of the magnet 52 coincides with the vertical direction orthogonal to the rod axis center line, and one side of the magnet 52 in the plate thickness direction (the upper side in the drawing in FIG. 1). ) Is the N pole, and the magnetic pole surface on the other side (the lower side in the drawing in FIG. 1) of the magnet 52 in the plate thickness direction is the S pole.

The magnetic body is made of a magnetic material such as iron, nickel, or ferrite that forms a closed magnetic path. This magnetic body has a rectangular parallelepiped upper and lower block (rod axis direction block: hereinafter abbreviated as a block) 54 and 55 extending along the longitudinal direction, that is, the rod axis center line, and the short direction, that is, the rod axis center line. And right and left blocks (rod vertical block: hereinafter abbreviated as “blocks”) 56 and 57 extending along a perpendicular line perpendicular to each other. Further, the magnetic body has a plurality of brackets 59 that are fastened and fixed on the magnetic moving body mounting surface of the first rod 31 using screws 58 such as fastening screws and fastening bolts. The center part of the blocks 54 and 55 has the 1st, 2nd magnet (magnet) holding | maintenance part arrange | positioned facing the air gap. The magnet 51 is held by a fixing means such as an adhesive in a state in which the inner surfaces (opposing surfaces) of the magnet holding portions of the blocks 54 and 55 are in contact with the magnetic pole surfaces (both polarities are S poles) of the magnets 51 and 52. It is fixed.
In addition, a magnet may be installed in the stroke sensor S side, and the magnetic mobile body 7 may be comprised only with a magnetic body.

The stroke sensor S is located in the middle of the magnetic circuit including the two magnets 51 and 52 constituting the magnetic moving body 7 and the magnetic body, that is, the sensor housing surrounded by the magnetic moving body 7. It is held by the sensor mounting portion (sensor holder) of the sensor cover 27 so as to be positioned in the space. The stroke sensor S is installed so as to protrude from the sensor mounting portion (sensor holder) of the sensor cover 27 to the first rod 31 side.
The stroke sensor S has a Hall element that is a non-contact type magnetic detection element that detects magnetic flux (magnetic flux density, magnetic field distribution, magnetic field strength) that changes as the magnetic moving body 7 moves in the stroke direction. is doing. This Hall element is provided with a magnetic sensitive surface F that senses the magnetic flux density (amount of magnetic flux) of the magnetic field applied from the magnetic moving body 7, particularly the magnets 51 and 52, and the strength of the magnetic field.

  The stroke sensor S includes a Hall IC that outputs an electrical signal (voltage signal, sensor output signal: hereinafter referred to as a sensor output value) corresponding to the magnetic flux density interlinking the magnetic sensing surface F of the Hall element to the ECU. Consists of the subject. This Hall IC is an IC chip in which a Hall element and an amplifier circuit are integrated, and is relatively relative to the magnetic moving body 7 in a rectangular sensor housing space formed inside the magnetic body. It is installed so that it can move. As a non-contact type magnetic detection element, a Hall element alone or a magnetoresistive element (MR element) may be used instead of the Hall IC.

Here, the magnetic circuit constituted by the magnetic movable body 7 and the stroke sensor S is held at the position indicated by the solid line in FIG. 1 when the waste gate valve 1 is in the fully closed position. When the waste gate valve 1 is in the fully open position, the magnetic circuit is held at the position indicated by the two-dot chain line in FIG. 1 and the position indicated by the solid line in FIG.
The magnetic circuit includes a magnet 51, a Hall IC having a Hall element, a first magnetic circuit of a closed magnetic circuit type configured by a magnetic block 57 and a block 54, a magnet 51, and a magnetic block 56 and a block 54. Closed magnetic circuit type second magnetic circuit, magnet 52, Hall IC having Hall element, closed magnetic circuit type third magnetic circuit constituted by magnetic material block 57 and block 55, and magnet 52, magnetic material block A closed magnetic circuit type fourth magnetic circuit constituted by 56 and a block 55 is provided.

  In addition, when the waste gate valve 1 is between the fully closed position and the fully open position, the stroke sensor S corresponds to the stroke position (relative position with respect to the reference position) of the magnetic moving body 7 and the stroke amount of the rod 4. In addition, the stroke position of the rod 4 corresponds to the valve opening degree of the waste gate valve 1. Therefore, the ECU measures the stroke position of the magnetic moving body 7, that is, the sensor output signal output corresponding to the change in the magnetic flux density, determines the stroke amount of the rod 4, and determines the waste amount from the stroke amount of the rod 4. The valve opening of the gate valve 1 can be obtained, and the flow rate of the exhaust gas flowing through the waste gate channel can be obtained from the valve opening.

  Here, as a method of sensing the stroke position of the magnetic moving body 7, when performing non-contact magnetic detection using a Hall IC, a Hall element or an MR element, the Hall of the magnetic moving body 7 and the stroke sensor S is used. If there is a magnetic material such as iron in the vicinity of a magnetic circuit composed of an IC, there is a possibility that the magnetic field detected by the non-contact type magnetic detection element cannot be secured stably. Therefore, the functional parts constituting the electric actuator of the present embodiment, that is, the functional parts arranged close to the magnetic circuit, the rod 4, the final gear 18, the plate cam 21, the follower 23, the pivot pin 24, and the final gear shaft 15 are not provided. By using a magnetic material (nonmagnetic metal such as stainless steel, nonmagnetic resin, etc.), the influence of a disturbance magnetic field on the magnetic circuit is avoided.

Here, in the actuator case of the electric actuator of this embodiment, in particular, the sensor cover 27, a male connector housing 8 that can be fitted into a female connector housing 9 that is a mating connector is integrally installed. .
The male connector housing 8 is installed in a direction perpendicular to the magnetic sensing surface F of the Hall element of the stroke sensor S, and is surrounded by the outline of the magnetic movable body 7, particularly a rectangular frame-shaped magnetic body. It is installed in a projection unit that projects (planar outer area) in the vertical direction of this region. Further, the male connector housing 8 extends over the entire area (area: indicated by a two-dot chain line in FIG. 1) in which the magnetic movable body 7 can move as the rod 4 of the electric actuator moves in the stroke direction. Installed. Thereby, the male connector housing 8 also has a function as an obstacle for preventing the arrangement of external parts (external magnetic body, external magnet, etc.) that give a magnetic obstacle to the stroke sensor S. .

Further, the male connector housing 8 is integrally formed with a cylindrical hood portion 61 extending outward from the outer wall surface of the electric motor M and the stroke sensor S, particularly the sensor cover 27.
A plurality of external connection terminals (connector terminals) 10 for electrically connecting the electric motor M or the stroke sensor S to an external power source or ECU are provided in the base portion 62 of the male connector housing 8 inside the hood portion 61. It is held and fixed so as to protrude and be exposed in the space. Further, on the outer peripheral surface of the hood portion 61, a lock protrusion 64 that is engaged with a lock arm (not shown) provided on the fitting cylinder portion 63 of the female connector housing 9 is integrally formed.
The male connector housing 8 and the plurality of connector terminals 10 constitute a male connector. The female connector housing 9, the plurality of terminals, and the terminal portions of the electric wires constitute a female connector.

[Operation of Example 1]
Next, the operation of the electric actuator for performing opening / closing control of the waste gate valve 1 of the present embodiment will be briefly described with reference to FIGS.

The ECU controls the power supply to the electric motor M so that the waste gate valve 1 is fully closed when the supercharging pressure detected by the supercharging pressure sensor is less than the set value.
As a result, the components of the electric actuator remain in the fully closed state, so that the waste gate valve 1 continues in the fully closed state. As a result, the waste gate channel is closed. As a result, the entire amount of exhaust gas discharged from the engine flows from the inlet portion of the turbine housing of the turbocharger, rotates the turbine impeller, and is discharged from the outlet portion of the turbine housing.
On the other hand, the intake air sucked into the intake pipe is compressed by the compressor impeller driven by the rotation of the turbine impeller, and the pressure (supercharging pressure) increases. The intake air whose pressure has increased is sucked into the engine.

The ECU controls the electric motor so that the waste gate valve 1 is fully opened when the supercharging pressure detected by the supercharging pressure sensor rises above a set value, that is, when it exceeds a preset maximum supercharging pressure. Control power supply to M.
As a result, the motor shaft 13 of the electric motor M rotates in the fully open direction. As a result, the motor torque is transmitted to the pinion gear 16, the intermediate gear 17, and the final gear 18. Then, the plate cam 21 to which the motor torque is transmitted from the final gear 18 rotates in the fully open direction by a predetermined rotation angle (a rotation angle equal to the operation angle of the final gear 18) as the final gear 18 rotates.
Then, the pivot pin 24 slides (slids) on the cam groove 22 and moves from the fully closed position to the fully open position of the cam groove 22, whereby the first rod 31 compresses the coil spring 6 and the stroke of the rod 4. Move linearly to the valve open side of the direction (push out) Then, with the linear movement of the rod 4, the first and second rods 31 and 32 and the connecting rod 33 linearly move to the valve opening side in the stroke direction of the rod 4.

Further, as the second rod 32 moves linearly, the first hinge pin 11 linearly moves to the valve opening side in the stroke direction of the rod 4, so that the link lever 3 rotates in the fully open direction around the second hinge pin 12. To do. Then, as the second hinge pin 12 rotates, the waste gate valve 1 also rotates in the fully open direction around the second hinge pin 12. As a result, the waste gate valve 1 is detached from the valve seat and is fully opened, so that the waste gate flow path is opened.
As a result, a part of the exhaust gas flowing from the engine to the inlet portion of the turbine housing is discharged to the outlet portion of the turbine housing through the waste gate flow path that bypasses the turbine impeller. As a result, the exhaust energy acting on the turbine impeller is reduced and the rotational speed of the turbine impeller is reduced, so that the turbocharger is prevented from over-rotating.
In addition, the supercharging pressure or the exhaust pressure does not become excessive. Further, the turbine impeller is prevented from being damaged due to excessive rotation of the turbine impeller.

The ECU controls power supply to the electric motor M so that the waste gate valve 1 is fully closed when the supercharging pressure detected by the supercharging pressure sensor is lower than a set value.
As a result, the motor shaft 13 of the electric motor M rotates in the fully closed direction. Thus, the motor torque is transmitted to the pinion gear 16, the intermediate gear 17, the final gear 18, and the plate cam 21. Then, the plate cam 21 rotates in the fully closed direction by a predetermined rotation angle as the final gear 18 rotates.
Then, the pivot pin 24 slides (slids) on the cam groove 22 and moves from the fully open position to the fully closed position of the cam groove 22, whereby the rod 4 moves linearly toward the valve closing side in the stroke direction of the rod 4. (Drawn back). Then, with the linear movement of the rod 4, the first and second rods 31 and 32 and the connecting rod 33 linearly move toward the valve closing side in the stroke direction of the rod 4.

Further, as the second rod 32 moves linearly, the first hinge pin 11 moves linearly toward the valve closing side in the stroke direction of the rod 4, so that the link lever 3 moves in the fully closed direction around the second hinge pin 12. Rotate. Then, as the second hinge pin 12 rotates, the waste gate valve 1 also rotates in the fully closed direction around the second hinge pin 12. Accordingly, the waste gate valve 1 is seated on the valve seat and is fully closed, so that the waste gate flow path is closed.
The waste gate valve 1 is controlled to be set to an intermediate opening between the fully closed position and the fully opened position based on the engine operating condition, particularly the supercharging pressure detected by the supercharging pressure sensor. . In this case, since the valve opening degree of the waste gate valve 1 is changed continuously or stepwise based on the boost pressure, the flow rate of the exhaust gas passing through the waste gate flow path can be finely adjusted continuously or stepwise. . Thereby, the supercharging pressure of the engine can be variably controlled continuously or stepwise.

[Feature 1 of Example 1]
As described above, in the waste gate valve control device according to the present embodiment, the magnetic moving body 7, in particular, the rectangular frame-shaped magnetic body is perpendicular to the magnetic sensing surface F of the Hall element of the stroke sensor S. Arrangement of external parts (external magnetic body, external magnet, etc.) that give a magnetic obstacle to the stroke sensor S on the projection part obtained by projecting the region (planar external area) surrounded by the outline in the vertical direction is prevented. There are obstacles for it. Thereby, arrangement | positioning of said external magnetic body, an external magnet, etc. is blocked | prevented around (near) the magnetic circuit comprised by the magnetic moving body 7 and the stroke sensor S. FIG.
Here, in the present embodiment, the male connector housing 8 having the hood portion 61 fitted inside the fitting cylinder portion 63 of the female connector housing 9 is employed as an obstacle. The hood portion 61 of the male connector housing 8 extends from the outer wall surface of the sensor cover 27 toward the outside.

And the magnetic circuit is installed in the range (area) which projected the area | region (planar external area) enclosed with the outline of the hood part 61 of the male connector housing 8 to this perpendicular direction. Thereby, an external magnetic body, an external magnet, etc. cannot be arrange | positioned also in the physique range of the food | hood part 61 of the male connector housing 8. FIG. That is, it is prevented that an external magnetic body, an external magnet, and the like are arranged around (near) the magnetic circuit.
As a result, the magnetic flux from the magnetic movable body 7, particularly the magnetic pole surfaces (N poles) of the two magnets 51 and 52, leaks to the external magnetic body, the external magnet, etc., and the magnetic flux passing through the magnetic sensing surface F of the Hall element decreases. Can be prevented. That is, the magnetic flux emitted from the magnetic pole surfaces (N poles) of the two magnets 51 and 52 leaks to the surroundings, and the amount of magnetic flux (magnetic flux density) applied to the magnetic sensing surface F of the Hall element decreases. Can be prevented.

In addition, a region (planar outer area) that is perpendicular to the magnetic sensing surface F of the Hall element of the stroke sensor S and surrounded by the outline of the magnetic moving body 7 is projected onto the projection unit. Even if an external magnetic body, an external magnet, or the like is disposed around the hood 61 of the male connector housing 8 by installing the male connector housing 8, the magnetic circuit and the external magnetic body or external magnet are arranged. A sufficient distance can be secured so as not to be affected by magnetic noise and disturbance magnetic field.
This makes it difficult for the magnetic circuit, particularly the Hall IC, to be affected by the magnetic noise and the disturbance magnetic field from the external magnetic body and the external magnet on the stroke sensor S. Therefore, the influence of the magnetic field disturbance around the magnetic circuit, particularly the Hall IC. Becomes infinitely small.
Therefore, the detection accuracy by the stroke sensor S, that is, the detection accuracy of the linear stroke amount of the rod 4 can be improved. As a result, the controllability of the stroke amount of the rod 4, that is, the controllability of the opening control of the waste gate valve 1 can be improved.

[Feature 2 of Example 1]
Further, in the waste gate valve control apparatus of the present embodiment, the area (planar outer area) surrounded by the outline of the magnetic moving body 7, in particular, the rectangular frame-like magnetic body, is projected onto this projection direction. A male connector housing 8 is installed. This prevents an external magnetic body, an external magnet, or the like that gives a magnetic obstacle to the stroke sensor S from being disposed around the magnetic circuit constituted by the magnetic moving body 7 and the stroke sensor S.
In addition, by installing the male connector housing 8 on the projection portion obtained by projecting the region (planar outer area) surrounded by the outline of the magnetic movable body 7, in particular, the rectangular frame-shaped magnetic body, in the vertical direction, Even when an external magnetic body, an external magnet, or the like is disposed around the male connector housing 8, magnetic noise or an external magnetic field is affected between the magnetic circuit and the external magnetic body, the external magnet, or the like. A sufficient distance can be secured.

[Feature 3 of Example 1]
Further, in the waste gate valve control device of the present embodiment, the entire area (full rod stroke) of the range (area) in which the magnetic movable body 7 can move with the movement of the actuator rod 4 in the stroke direction is obtained. An obstacle (the hood 61 of the male connector housing 8) is installed. Thereby, the influence of the disturbance magnetic field by an external magnetic body, an external magnet, etc. can be made small with respect to the range (area) which the magnetic mobile body 7 can move.
Therefore, the detection accuracy by the stroke sensor S, that is, the detection accuracy of the linear stroke amount of the rod 4 can be improved. As a result, the controllability of the stroke amount of the rod 4, that is, the controllability of the opening control of the waste gate valve 1 can be improved.

[Feature 4 of Example 1]
Further, in the waste gate valve control device of the present embodiment, each functional component (rod 4 and final gear 18) constituting the electric actuator on the opposite side to the male connector housing 8 side with the rod axis center line as a boundary. , Plate cams 21 and the like). As a result, even when an external magnetic body, an external magnet, or the like is disposed around the male connector housing 8, magnetic noise or a disturbance magnetic field is generated between the magnetic circuit and the external magnetic body, the external magnet, or the like. It is possible to secure a sufficient distance that does not affect.
Further, the rod 4, the final gear 18, the plate cam 21, the follower 23, the pivot pin 24, and the final gear shaft 15, which are functional parts of the electric actuator, are formed of a non-magnetic material that hardly causes a magnetic obstacle to the stroke sensor S. is doing. That is, no magnetic noise or disturbance magnetic field is generated for the magnetic circuit.

[Features of Example 2]
FIG. 6 shows a second embodiment of the present invention and is a diagram showing the positional relationship between the stroke sensor and the male connector housing.

The male connector housing (obstacle) 8 of the present embodiment includes a protruding rib 65 protruding outward from the outer wall surface of the sensor cover 27, and the sensor cover 27 extending outward from the side surface of the protruding rib 65. It is comprised by the cylindrical food | hood part 66 grade | etc., Which protrudes along the surface direction.
The male connector housing 8 is installed in a direction perpendicular to the magnetic sensing surface F of the Hall element of the stroke sensor S, and an area (planar outer area) surrounded by the outline of the magnetic moving body 7 is defined in the vertical direction. The direction of connection with the female connector housing 9, that is, the direction of the opening of the hood 66 is free.

[Configuration of Example 3]
FIG. 7 shows a third embodiment of the present invention, and is a view showing an example in which a male connector housing is installed on the shaft runout range of the rod.

  In the waste gate valve control apparatus of the present embodiment, a link mechanism that converts the linear motion of the rod 4 into the rotational motion of the waste gate valve 1 is installed between the shaft 2 of the waste gate valve 1 and the rod 4 of the electric actuator. is doing. This link mechanism is configured by a link lever 3 or the like having one end connected to the rod 4 via the first hinge pin 11 and the other end connected to the shaft 2 of the waste gate valve 1 via the second hinge pin 12. .

  The link lever 3 has a rotation shaft (rotation center of the link lever 3) on the same axis as the rotation center axis of the waste gate valve 1, and is coupled to the rod 4 and the waste gate valve 1. A second coupling portion coupled to the shaft 2. When the waste gate valve 1 rotates between the fully closed position and the fully open position, the first coupling portion is a rotation operation line (curve of a predetermined radius of curvature centered on the rotation axis of the link lever 3). The link lever 3 is configured to move on a rotation operation line (a dashed line in the figure).

  Here, the rotation operation line of the link lever 3 is a rotation operation point on the rotation operation line of the link lever 3 at which the waste gate valve 1 is fully closed as shown in FIG. Rotation of the link lever 3 when the fully closed point on the operating line and the rotational operating point on the rotational operating line of the link lever 3 at which the waste gate valve 1 is fully opened is the fully open point on the rotational operating line of the link lever 3 An arc connecting a fully closed point on the operating line and a fully open point on the rotational operating line of the link lever 3 with a curve of a predetermined radius of curvature centering on the rotation center axis of the waste gate valve 1 (rotating axis of the link lever 3). It is a trajectory.

Further, in the waste gate valve control apparatus of the present embodiment, as shown in FIG. 7, the male connector is provided over the entire range of the range in which the rod 4 can swing with the opening / closing operation of the waste gate valve 1. A housing (obstacle) 8 is installed.
Here, the range in which the rod 4 can swing, that is, the range in which the magnetic movable body 7 can swing is set as follows.
That is, the rotation operating point on the rotation operating line of the link lever 3 at which the waste gate valve 1 is fully closed is the fully closing point (A) on the rotation operating line of the link lever 3, and the waste gate valve 1 is fully opened. The rotation operation point on the rotation operation line of the link lever 3 that becomes the opening degree is set as the fully open point (B) on the rotation operation line of the link lever 3.

When the waste gate valve 1 is fully closed, the straight line connecting the rotation axis LO of the link lever 3 (rotation center of the link lever 3) LO and the fully closed point (A) is the fully closed lever center line L1, and A straight line connecting the rotation center LO of the link lever 3 and the fully open point (B) when the gate valve 1 is fully opened is set as the fully open lever center line L2.
The angle center line between the fully closed lever center line L1 and the fully opened lever center line L2 is defined as the lever operating angle center line LC, and the center line in the stroke direction (axial direction) of the rod 4 is the rod axis center line. Set as RC.

A fully closed point on the rotation operating line of the link lever 3 is set as a point A, a point symmetrical with the point A around the bearing center O of the thrust bearing 5 is set as a point A ′, and the lever operation is performed. An intersection point where the angle center line LC and the rod axis center line RC are perpendicular to each other is a point C, and a point which is symmetrical to the point C about the bearing center O of the thrust bearing 5 is a point C. Set as'.
When set as described above, the range in which the rod 4 can swing, that is, the range in which the magnetic movable body 7 can swing, passes through the bearing center O of the thrust bearing 5 and connects the point A and the point A ′. The first straight line AOA ′ or an extended line of the first straight line AOA ′ and the second straight line COC ′ passing through the bearing center O of the thrust bearing 5 and connecting the point C and the point C ′ or the extended line of the second straight line COC ′ And the intersection angle ∠A'OC '.

[Features of Example 3]
As described above, in the waste gate valve control device of this embodiment, the linear motion of the rod 4 is converted into the rotational motion of the waste gate valve 1 between the shaft 2 of the waste gate valve 1 and the rod 4 of the electric actuator. A link mechanism is installed. In the case of such a structure, when the link lever 3 is rotated by the thrust of the rod 4 of the electric actuator and the waste gate valve 1 is rotated, the shaft 4 is swung around the bearing center O of the thrust bearing 5. appear. When the rod 4 swings, the distance between the magnetic pole surfaces of the magnets 51 and 52 of the magnetic moving body 7 and the magnetic sensing surface F of the Hall element of the stroke sensor S that are integrally installed on the first rod 31 varies. Thus, the change in magnetic flux density (magnetic field strength) interlinking the magnetic sensitive surface F of the Hall element does not correspond to the stroke position of the rod 4 and varies, so that the reliability of the sensor output signal decreases. is there.

Therefore, in the waste gate valve control apparatus of the present embodiment, the entire region of the range in which the rod 4 can swing with the opening and closing operation of the waste gate valve 1, that is, the magnetic movement with the shaft swing of the rod 4. A male connector housing 8 serving as an obstacle is installed over the entire range (area) in which the body 7 can swing. Thereby, in addition to the disposition of the external magnetic body and the external magnet in the rod stroke direction which is the same as the rod axis direction, the external magnetic body and the external magnet cannot be disposed in the rod shaft swing direction. Thereby, the further improvement of the detection accuracy by the stroke sensor S can be expected.
Here, the magnetic circuit constituted by the magnetic movable body 7 and the stroke sensor S is held at the position indicated by the solid line in FIG. 7 when the waste gate valve 1 is in the fully closed position. Further, the magnetic circuit is held at a position indicated by a two-dot chain line in FIG. 7 when the waste gate valve 1 is in the fully open position.

[Features of Example 4]
FIG. 8 shows Embodiment 4 of the present invention, and is a view showing an example in which a magnetic movable body is arranged in the physique range of the female connector housing.

In the waste gate valve control apparatus of this embodiment, the magnetic sensor 7 is surrounded by the outline of the magnetic moving body 7, particularly a rectangular frame-shaped magnetic body, in a direction perpendicular to the magnetic sensing surface F of the Hall element of the stroke sensor S. An obstacle for preventing the arrangement of an external magnetic body, an external magnet, or the like that gives a magnetic obstacle to the stroke sensor S is installed on the projection portion obtained by projecting the region (planar outer area) in the vertical direction. .
In addition, the obstacle is installed in a projection unit that projects in the vertical direction an area (planar outer area) surrounded by the outline of the magnetic movable body 7, in particular, a rectangular frame-like magnetic body. This prevents an external magnetic body, an external magnet, or the like from being arranged around (near) the magnetic circuit formed by the magnetic moving body 7 and the stroke sensor S.
Furthermore, the obstacle is installed over the entire region (full rod stroke) of the range (area) in which the magnetic movable body 7 can move as the rod 4 moves in the stroke direction. Thereby, the influence of the disturbance magnetic field by an external magnetic body, an external magnet, etc. can be made small with respect to the range (area) which the magnetic mobile body 7 can move.

Here, in the present embodiment, the female connector housing 9 having the fitting cylinder portion 63 fitted to the outside of the hood portion 61 of the male connector housing 8 is employed as an obstacle.
That is, by installing the magnetic circuit in the area (area) projected in the vertical direction of the area (planar outer area) surrounded by the outline of the fitting cylindrical portion 63 of the female connector housing 9, the male side Even when the magnetic circuit cannot be covered only by the physique of the hood portion 61 of the connector housing 8 or when the hood portion 61 of the male connector housing 8 is arranged shifted from the center of the magnetic circuit, the female connector Even within the physique range of the fitting cylinder portion 63 of the housing 9, an external magnetic body, an external magnet, or the like cannot be arranged.
As a result, the magnetic flux from the magnetic moving body 7, particularly the magnetic pole surfaces (N poles) of the two magnets 51 and 52, leaks to the external magnetic body or external magnet and passes through the magnetic sensing surface F of the Hall element of the stroke sensor S. It is possible to prevent the magnetic flux to be reduced. Further, since it is difficult for the stroke sensor S to be affected by magnetic noise from an external magnetic body, an external magnet, or the like, the influence of the magnetic field disturbance around the stroke sensor S is minimized.

A male connector housing 8 is installed in a vertical direction perpendicular to the magnetic sensing surface F of the Hall element of the stroke sensor S, and a female connector housing is provided outside the hood portion 61 of the male connector housing 8. 9, even when an external magnetic body, an external magnet, or the like is disposed around the fitting cylinder 63 of the female connector housing 9, the magnetic circuit and the external It is possible to ensure a sufficient distance between the magnetic body and the external magnet so as not to be affected by the disturbance magnetic field.
Therefore, the detection accuracy by the stroke sensor S, that is, the detection accuracy of the linear stroke amount of the rod 4 can be improved. As a result, the controllability of the stroke amount of the rod 4, that is, the controllability of the opening control of the waste gate valve 1 can be improved.
Here, the magnetic circuit constituted by the magnetic movable body 7 and the stroke sensor S is held at the position indicated by the broken line in FIG. 8 when the waste gate valve 1 is in the fully closed position. Further, the magnetic circuit is held at the position indicated by the two-dot chain line in FIG. 8 when the waste gate valve 1 is in the fully open position.

[Features of Example 5]
FIG. 9 shows a fifth embodiment of the present invention, and is a diagram showing an example in which a magnetic movable body is arranged in the assembling work range of the female connector housing.

In the waste gate valve control device of the present embodiment, in addition to the features of the fourth embodiment, a pair of male and female connector housings 8 are provided in the region surrounded by the outline of the fitting cylindrical portion 63 of the female connector housing 9. A magnetic field constituted by the magnetic moving body 7 and the stroke sensor S is within a range (area) obtained by projecting a region (planar outer area) to which work spaces (shown hatched portions) 71 and 72 for connecting 9 are added in the vertical direction. A circuit is installed. The work spaces 71 and 72 are work spaces for the operator's fingers and assembling jigs necessary for connecting the female connector housing 9 to the male connector housing 8.
Accordingly, even when the magnetic circuit cannot be covered only by the physique of the fitting cylinder portion 63 of the female connector housing 9, or when the male and female connector housings 8 and 9 are connected by shifting from the center of the magnetic circuit. An external magnetic body, an external magnet, and the like are also disposed within a range including the physique range of the fitting cylindrical portion 63 of the female connector housing 9 and the work spaces 71 and 72 for connecting the pair of male and female connector housings 8 and 9. I can't.

As a result, the same effect as in the fourth embodiment can be obtained, so that the detection accuracy by the stroke sensor S, that is, the detection accuracy of the linear stroke amount of the rod 4 can be improved. As a result, the controllability of the stroke amount of the rod 4, that is, the controllability of the opening control of the waste gate valve 1 can be improved.
Here, when the waste gate valve 1 is in the fully closed position, the magnetic circuit constituted by the magnetic moving body 7 and the stroke sensor S is held at the position indicated by the broken line in FIG. Further, the magnetic circuit is held at the position indicated by the two-dot chain line in FIG. 9 when the waste gate valve 1 is in the fully open position.

[Features of Example 6]
FIG. 10 shows Embodiment 6 of the present invention, and is a view showing an example in which a magnetic movable body is arranged in the assembling work range of the female connector housing.

  In the waste gate valve control device of the present embodiment, in addition to the features of the fourth and fifth embodiments, a pair of male and female connector housings is provided in the region surrounded by the outline of the fitting cylindrical portion 63 of the female connector housing 9. The magnetic movable body 7 and the stroke sensor S are included in a range (area) obtained by projecting a region (planar outer area) to which work spaces (shown hatched portions) 73 and 74 for connecting 8, 9 are added in the vertical direction. A magnetic circuit is installed. The work spaces 73 and 74 are work spaces for the operator's fingers and assembling jigs necessary for connecting the female connector housing 9 to the male connector housing 8.

As described above, the pair of male and female connector housings 8 and 9 are arranged such that the work spaces 73 and 74 are within the range (area) in which the magnetic circuit is projected in the vertical direction.
As a result, the same effects as in the fourth and fifth embodiments can be obtained, so that the detection accuracy by the stroke sensor S, that is, the detection accuracy of the linear stroke amount of the rod 4 can be improved. As a result, the controllability of the stroke amount of the rod 4, that is, the controllability of the opening control of the waste gate valve 1 can be improved.
Here, the magnetic circuit constituted by the magnetic movable body 7 and the stroke sensor S is held at the position indicated by the broken line in FIG. 10 when the waste gate valve 1 is in the fully closed position. Further, the magnetic circuit is held at a position indicated by a two-dot chain line in FIG. 10 when the waste gate valve 1 is in the fully open position.

[Modification]
In this embodiment, the valve control device of the present invention is applied to a waste gate valve control device that controls an electric actuator that drives the waste gate valve 1. However, the valve control device of the present invention can be used for exhaust gas such as EGR gas. Exhaust gas temperature that controls (adjusts) the ratio of the amount of EGR gas that passes through the EGR cooler and the amount of EGR gas that bypasses the EGR cooler. You may apply to the valve control apparatus which controls the electric actuator which drives the valve body (valve) of a control valve.

In the present embodiment, as the actuator, the rod 4 connected to the waste gate valve 1 via the link lever 3 is reciprocated in the axial direction (stroke direction) using the driving force of the electric motor M, thereby causing the waste gate valve. 1 is used, but as the actuator, the valve is driven by reciprocating the rod connected to the valve via a lever in the axial direction (stroke direction) using electromagnetic force or fluid pressure. An electromagnetic actuator or a fluid pressure actuator may be used.
In addition to the waste gate valve 1, it can also be used as a valve control device that controls opening and closing of a valve body (valve) of a fluid control valve that controls the fluid flowing through the flow path.
Further, as an engine, not only a diesel engine but also a gasoline engine may be used.

F Magnetic sensing surface of the Hall element of the stroke sensor (Hall IC) M Electric motor (power source)
S Stroke sensor (Rod stroke detection means, Hall IC)
1 Wastegate valve 2 Wastegate valve shaft 3 Link mechanism link lever 4 Electric actuator rod 5 Thrust bearing (rod bearing)
6 Coil spring (rod (valve) biasing means)
7 Magnetic moving body (rod stroke detection means)
8 Male connector housing (obstacle)
9 Female connector housing (obstacle)
10 Connector terminal (external connection terminal)
16 Pinion gear of reduction mechanism 17 Intermediate gear (drive gear) of reduction mechanism
18 Final gear of the reduction mechanism (driven gear)
21 Conversion mechanism plate cam 22 Plate cam cam groove 23 Conversion mechanism follower 24 Conversion mechanism pivot pin (rod support shaft)
51 Magnet (first magnet)
52 Magnet (second magnet)
61 Male connector housing hood 63 Female connector housing fitting tube 71 Working space 72 Working space 73 Working space 74 Working space

Claims (13)

(A) an actuator for driving the valve and having a rod extending in the axial direction, and reciprocating the rod in the axial direction;
(B) stroke detecting means for detecting the amount of movement of the rod in the axial direction;
In the valve control device that performs opening / closing control of the valve according to the amount of movement of the rod in the axial direction,
The stroke detecting means includes a magnetic moving body including a magnet that is integrally installed on the rod and generates a magnetic field having a constant magnetic flux density, and a sensor that detects a magnetic flux that changes as the magnetic moving body moves. Have
The sensor has a magnetic sensing surface that senses the magnetic flux of the magnetic field applied from the magnetic moving body,
The actuator includes an obstacle that is installed in a perpendicular direction perpendicular to the magnetic sensing surface of the sensor and prevents an external component that gives a magnetic obstacle to the sensor. Is a valve control device formed of a non-magnetic material. The valve control device according to claim 1,
The valve control device according to claim 1, wherein the obstacle is installed in a projection unit that projects a region surrounded by an outline of the magnetic moving body in a direction perpendicular to the region. In the valve control device according to claim 1 or 2,
The said obstacle is installed over the whole area | region of the range which the said magnetic mobile body can move with the movement to the axial direction of the said rod, The valve | bulb control apparatus characterized by the above-mentioned. In the valve control device according to any one of claims 1 to 3,
The actuator has a rod bearing that supports the rod slidably in the axial direction while allowing the shaft to swing.
The valve control device according to claim 1, wherein the obstacle is installed over the entire range in which the rod can swing with the opening and closing operation of the valve. In the valve control device according to any one of claims 1 to 4,
Each of the functional parts constituting the actuator is arranged on the opposite side to the obstacle side with a center line in the axial direction of the rod as a boundary. The valve control device according to any one of claims 1 to 5,
Each functional component constituting the actuator is formed of a nonmagnetic material. In the valve control device according to any one of claims 1 to 6,
It has a pair of male and female connector housings that can be fitted together,
The male connector housing of the pair of male and female connector housings has a cylindrical hood portion extending outward from the sensor,
The female connector housing of the pair of male and female connector housings has a cylindrical fitting tube portion that fits outside the hood portion. The valve control device according to claim 7,
The obstacle is the male connector housing,
The valve control device according to claim 1, wherein the magnetic moving body and the sensor are installed in a range obtained by projecting a region surrounded by an outline of the hood portion in a direction perpendicular to the region. The valve control device according to claim 7,
The obstacle is the female connector housing,
The valve control device according to claim 1, wherein the magnetic moving body and the sensor are installed in a range in which a region surrounded by an outline of the fitting cylinder portion is projected in a direction perpendicular to the region. The valve control device according to claim 7,
The obstacle is the female connector housing,
The magnetic movable body and the sensor are within a range obtained by projecting a region in which a work space for connecting the pair of male and female connector housings is added to the region surrounded by the outline of the fitting tube portion in the vertical direction of the region. It is installed in the valve control device. In the valve control device according to any one of claims 1 to 10,
The actuator includes a deceleration mechanism that decelerates rotation of a motor that is a power source, and a conversion mechanism that converts rotational motion of the deceleration mechanism into linear motion of the rod. The valve control device according to claim 11,
The speed reduction mechanism includes a drive gear that is rotationally driven by the motor, and a driven gear that meshes with the drive gear and rotates. The valve control device according to claim 11 or 12,
The conversion mechanism includes a cam groove having a shape corresponding to the operation pattern of the valve, and includes a cam that rotates as the speed reduction mechanism rotates, and a follower that is movably inserted into the cam groove.
The rod has a support shaft that rotatably supports the follower, one end side is connected to the cam via the follower and the support shaft, and the other end side is connected to the valve. apparatus.

Images