JP4862733B2 - Rotation angle detector - Google Patents

Description

  The present invention relates to a rotation angle detection device including a rotation angle sensor that detects a rotation angle of a detection object using output change characteristics of a magnetic detection element with respect to a rotation angle of a magnet.

[Conventional technology]
Conventionally, as shown in FIG. 12, for example, a magnet 101 fixed to an axial end portion of a rotation axis of a detection object such as a throttle valve, and a magnetic sensing device (Hall IC) for the rotation angle of the magnet 101. Rotation provided with a rotation angle sensor 102 that detects the rotation angle of the object to be detected using the output change characteristics of the sensor, and an open yoke that forms a magnetic circuit (for example, an open magnetic path) together with the magnet 101 and the rotation angle sensor 102. An angle detection device is known (see, for example, Patent Document 1).

  Here, the rotation angle sensor 102 has a magnetic sensing device fixed on a flat board 103. Further, the open type yoke includes two first and second magnetic bodies 104 and 105 that are divided so as to be plane symmetric (laterally symmetric) with respect to a vertical plane perpendicular to the rotation axis of the detection target. Become. The open-type yoke is rotated by a yoke body 111 that forms a gap with the magnet 101 for each of the two first and second magnetic bodies 104 and 105, and an edge of the yoke body 111 in the plate width direction. It has a protruding piece 112 protruding from the angle sensor side.

  The two first and second magnetic bodies 104 and 105 are arranged such that their plate thickness directions are parallel to the rotation axis direction of the detection target, and one side is open. Moreover, the front-end | tip part of the protrusion piece 112 formed for every two 1st, 2nd magnetic bodies 104 and 105 is opposingly arranged across the magnetic flux detection gap. The magnet 101 is disposed so as to be rotatable relative to each yoke body 111 formed for each of the two first and second magnetic bodies 104 and 105. Further, the rotation angle sensor 102 is disposed in a magnetic flux detection gap formed between the opposing portions of the projection pieces 112 formed for each of the two first and second magnetic bodies 104 and 105. A gap is formed between the facing portion 112.

[Conventional technical problems]
However, the rotation angle detection device described in Patent Document 1 includes a left-right symmetrical open magnetic path type open yoke. In such a symmetrical magnetic body (open yoke) shape, a gap between the magnet 101 and the open yoke (two first and second magnetic bodies 104 and 105), which determines the characteristic accuracy of the magnetic sensing device, In addition, it is very difficult to manage the gap between the rotation angle sensor 102 and the open type yoke (the two first and second magnetic bodies 104 and 105) at the same time with high accuracy. For this reason, there has been a problem that gaps vary between products and characteristic variations occur between products.

In the case of an open magnetic path type open yoke (two first and second magnetic bodies 104 and 105), an external magnetic field (for example, an alternator (alternator) mounted on a vehicle) or a magnetic body When an iron-based fastening bolt or bracket (for example, an iron-based fastening bolt or bracket) is installed in the vicinity of the rotation angle sensor 102, the magnetic sensing device with respect to the rotation angle of the magnet 101 due to the influence of the external magnetic field and the magnetic material on the magnetic sensing device. There has been a problem that the output change characteristics of the output change significantly. In the case of an open magnetic path type open yoke (two first and second magnetic bodies 104 and 105), each yoke body 111 formed for each of the two first and second magnetic bodies 104 and 105 is provided. The front end in the plate length direction (yoke open end) is open. For this reason, there is a problem that the magnetic sensing device is easily affected by radio noise, and the output change characteristic of the magnetic sensing device with respect to the rotation angle of the magnet 101 changes significantly.
US Pat. No. 5,164,668 (FIGS. 1-9)

  An object of the present invention is to eliminate a variation in the gap between products and eliminate a variation in characteristics between products by sandwiching a rotation angle sensor in each bent piece formed at each of two divided portions of the open yoke. An object of the present invention is to provide a rotation angle detection device capable of performing the above. In addition, the rotation angle detection device can suppress the change in the output change characteristic of the magnetic detection element with respect to the rotation angle of the magnet by reducing the influence of radio noise, external magnetic field and magnetic material on the open type yoke or rotation angle sensor. Is to provide.

According to the first aspect of the present invention, the open type yoke for concentrating the magnetic flux emitted from the magnet on the rotation angle sensor is a magnetic body magnetized by the magnet, and one side is open.
The open type yoke is constituted by two divided parts, and a yoke body that forms an air gap between the two divided parts and the magnet, and a predetermined bending with respect to the yoke body. A plate-like bent piece bent at an angle is formed.
Each bent piece formed for each of the two divided portions has a protruding piece protruding from one end edge in the plate width direction of each yoke body formed in each of the two divided portions to one side in the plate width direction. It is formed by bending at a predetermined bending angle in the thickness direction.
Then, by sandwiching the rotation angle sensor from both sides in the thickness direction of each bent piece formed for each of the two divided portions of the open yoke, the rotation angle sensor and the two divided portions of the open yoke are interposed. Since there is no gap, it is not necessary to manage the gap with high accuracy. Moreover, since there is no variation in the gap between products, the variation in characteristics between products can be eliminated. That is, since the output change characteristic of the magnetic detection element with respect to the rotation angle of the magnet can be stabilized, variations in detection accuracy among products can be suppressed.

  Here, a magnet (magnet) that rotates with the rotation of the rotation axis of the detection target and is magnetized in the radial direction perpendicular to the rotation axis of the detection target may be employed as the magnet. Further, as the magnet, a magnet (magnet) that rotates in accordance with the rotation of the rotation axis of the detection target and is magnetized so that the directions of the magnetic lines of force inside the magnet are parallel to each other (parallel) may be employed. In these cases, even when the use angle range (detection angle range) of the detection target is large, the linearity of the output change characteristic of the magnetic detection element with respect to the rotation angle of the magnet can be improved.

  In addition, each yoke body formed for each of the two divided portions has a plane including an axis (reference line) connecting the center of the rotation angle sensor in the plate thickness direction and the rotation center of the magnet and the rotation axis of the detection object. You may arrange | position so that it may become plane symmetry on a boundary. In this case, the magnetic flux flowing through the two divided portions of the open type yoke can be concentrated on the rotation angle sensor. Thereby, since the magnetic flux emitted from the magnet can be efficiently linked to the magnetic detection element, the output of the magnetic detection element is increased. Moreover, you may make it comprise the open type yoke which consists of the divided | segmented two division parts combining one type of magnetic body. In this case, since parts can be shared, costs can be reduced.

According to the second aspect of the present invention, since the rotation angle sensor is arranged in the magnetic flux detection gap formed between the bent pieces formed for each of the two divided portions of the open type yoke, it comes out of the magnet. The magnetic flux passes through the magnetic flux detection gap through the yoke body and the bent piece formed in one of the two divided portions, and is further bent in the other divided portion of the two divided portions. A magnetic circuit is formed so as to return to the magnet through the yoke body.
At this time, an output corresponding to the magnetic flux density passing through the magnetic flux detection gap is generated from the magnetic detection element of the rotation angle sensor. In addition, the magnetic flux density which passes a magnetic flux detection gap changes according to the rotation angle of a magnet. Moreover, the magnet is being fixed to the rotating shaft of the detection target object. Therefore, the rotation angle of the detection target can be detected using the output change characteristic of the magnetic detection element with respect to the rotation angle of the magnet.

According to the third aspect of the present invention, the protruding piece that protrudes from the one end edge in the plate width direction of each yoke main body formed in each of the two divided portions of the open type yoke to the one side in the plate width direction has a rotation angle. By bending toward the sensor side, the bent pieces formed for each of the two divided portions of the open type yoke are provided so as to face each other.
Note that the protruding piece protruding from the one end edge in the plate width direction of each yoke body to the one side in the plate width direction is centered on the one end edge in the plate width direction of each yoke body, and the rotation angle sensor side (in the plate thickness direction). Each folded piece formed for each of the two divided portions of the open type yoke may be formed by bending (to wrap around or abut) one side.
According to the fourth aspect of the present invention, the bending angle of each bent piece with respect to each yoke body formed for each of the two divided portions is set to an angle that allows the rotation angle sensor to fall within the plate width dimension of each yoke body. As a result, an increase in the plate width dimension of the product can be suppressed. Thereby, the mounting space of a product can be ensured easily.

  According to the invention described in claim 5, by setting the bending angle of each bent piece with respect to each yoke body formed for each of the two divided portions to an obtuse angle larger than a right angle, the large plate width dimension of the product is obtained. Can be suppressed. Thereby, the mounting space of a product can be ensured easily. Note that the bending angle of each bent piece with respect to the yoke body formed in at least one of the two divided portions may be set to an obtuse angle larger than a right angle. Further, for each of the two divided portions, each bent piece formed for each of the two divided portions is opposed to each other with a predetermined magnetic flux detection gap therebetween. The bent pieces formed in the above may be bent in the same direction or in different directions.

According to the invention described in claim 6, one kind of magnetic body is combined by setting the bending angle of each bent piece with respect to each yoke body formed for each of the two divided portions to be substantially the same angle. Thus, an open type yoke (two divided portions) can be formed. Thereby, since parts can be shared, costs can be reduced.
According to the seventh aspect of the present invention, the two divided portions have a plate width dimension that is at least equal to the plate thickness dimension of the plate magnet. Thereby, the magnetic flux emitted from the magnet can be efficiently concentrated on the rotation angle sensor, particularly the magnetic detection element. Thereby, since the magnetic flux emitted from the magnet can be efficiently linked to the magnetic detection element, the output of the magnetic detection element is increased.
According to the invention described in claim 8, by forming the two divided portions so that the plate width gradually decreases from the end portion on the magnet side toward the end portion on the sensor side, for example, the rotation angle sensor Even if the size is small, the magnetic flux emitted from the magnet can be efficiently guided to the rotation angle sensor, particularly the magnetic detection element. Thereby, since the magnetic flux emitted from the magnet can be efficiently linked to the magnetic detection element, the output of the magnetic detection element is increased.

According to the ninth aspect of the present invention, the rotation angle sensor has both magnetosensitive surfaces that are in contact with the bent pieces on both sides in the plate thickness direction. And the surface direction of both the magnetic sensitive surfaces of a rotation angle sensor inclines so that it may cross | intersect with a predetermined | prescribed crossing angle at the perpendicular plane perpendicular | vertical with respect to the rotating shaft of a detection target.
According to invention of Claim 10, the magnetic detection element is sealed in the sealing member which comprises the main-body part of a rotation angle sensor.
According to the eleventh aspect of the present invention, the rotation angle sensor is provided with a group of lead terminals drawn out from the magnetic detection element.

  According to the twelfth aspect of the present invention, at least the plate having the yoke holding portion for holding and fixing the open type yoke is formed of a resin material (nonmagnetic material) such as a thermoplastic resin. Then, by forming a cover that forms a sensor housing space for housing the rotation angle sensor and the open type yoke between the plate and the magnetic material, even if the external magnetic field and the magnetic body approach, It can absorb the magnetism from the magnetic material. As a result, the rotation angle sensor, in particular, the magnetic detection element is hardly affected by the external magnetic field and the magnetic material, and is lessened, and the change in the output change characteristic of the magnetic detection element with respect to the rotation angle of the magnet can be suppressed. . Note that the magnet may be rotatably accommodated inside the cover and in the vicinity of the yoke holding portion of the plate.

According to a thirteenth aspect of the present invention, the rotation angle sensor is provided with a lead terminal group drawn out from the magnetic detection element. The cover is filled with a thermosetting resin to seal the lead terminal group of the rotation angle sensor. As a result, it is possible to prevent the occurrence of a phenomenon (migration) that lowers the electrical insulation between the lead terminals of the lead terminal group of the rotation angle sensor.
Here, the dimension in the width direction of the product can be suppressed by pulling out the lead terminal group of the rotation angle sensor from the magnetic detection element so as to be substantially along the surface direction of the plate.

According to the invention described in claim 14, internal parts such as a rotation angle sensor and an open type yoke sealed by the thermosetting resin by providing the cover with a locking portion for locking the thermosetting resin. The linear expansion movement can be minimized. As a result, it is possible to stabilize the output change characteristic of the magnetic detection element with respect to the rotation angle of the magnet, thereby suppressing variations in detection accuracy between products.
According to the fifteenth aspect of the present invention, it is possible to prevent a conduction failure such as disconnection of a plurality of conductors that electrically connect the lead terminal group of the rotation angle sensor and the connector terminal group of the connector. The reliability of the sensor can be improved. In addition, a plurality of lead terminals of the rotation angle sensor are peeled off from a plurality of conductors that electrically connect the lead terminal group of the rotation angle sensor and the connector terminal group of the connector. Occurrence of a phenomenon (migration) that reduces electrical insulation between conductors and between connector terminals of the connector terminal group of the connector can be prevented.

  According to the sixteenth aspect of the present invention, the housing for fixing the cover in surface contact may be formed of an aluminum alloy mainly composed of aluminum having a small electrical resistance. In this case, radio wave noise that reaches the cover is efficiently released from the cover to the housing, so that the rotation angle sensor, in particular, the magnetic detection element is not easily affected by radio wave noise, and the magnetic detection element with respect to the rotation angle of the magnet It is possible to minimize the change in the output change characteristic.

  The best mode for carrying out the present invention is to eliminate the variation in the gap between products and eliminate the characteristic variation between the products, in each bent piece formed for each of the two divided portions of the open type yoke. Realized by inserting a rotation angle sensor. Further, the object of suppressing the change in the output change characteristic of the magnetic detection element with respect to the rotation angle of the magnet is realized by reducing the influence of the radio noise, the external magnetic field and the magnetic material on the open type yoke or the rotation angle sensor.

[Configuration of Example 1]
FIGS. 1 and 2 show Embodiment 1 of the present invention. FIG. 1 is a diagram showing an overall configuration of a rotation angle detection device, and FIG. 2 is a diagram showing a main configuration of the rotation angle detection device. .

The control device (engine control system) for an internal combustion engine of the present embodiment is directed to a combustion chamber of an internal combustion engine (for example, a single-cylinder four-cycle gasoline engine for a two-wheeled vehicle: hereinafter referred to as an engine) mounted on a vehicle such as a two-wheeled vehicle. An electronically controlled fuel injection device that injects and supplies fuel, an intake module (intake air amount control device) incorporated in the intake system of the engine, and an engine control unit (ECU) that controls these systems in association with each other I have.
The electronically controlled fuel injection device pressurizes fuel (for example, gasoline) to a certain pressure by an electric fuel pump and sends it to an injector (electromagnetic fuel injection valve) through a fuel filter. It is a device (system) that enables injection.

  The intake module of this embodiment controls the intake air amount (intake amount) supplied into the combustion chamber of the engine based on the throttle operation amount of a throttle operation part such as a throttle lever or a throttle handle of a vehicle such as a two-wheeled vehicle. This is a quantity control device (intake passage opening / closing device, system). Note that the throttle operation amount corresponds to a driver's accelerator pedal depression amount (accelerator operation amount) in a four-wheeled vehicle. In addition, the intake module includes a throttle body (not shown) incorporated in the middle of an engine intake pipe connected to the intake port of the engine, and a throttle valve (detection target: FIG. And a rotation angle detecting device for detecting the rotation angle of the throttle valve.

  The throttle body is integrally formed of a nonmagnetic material (for example, a resin material such as a thermoplastic resin). This throttle body has a cylindrical throttle bore wall portion (hereinafter referred to as a cylindrical portion) in which an intake passage having a circular cross section (hereinafter referred to as a throttle bore) is formed, and an intake flow direction of the cylindrical portion. Cylindrical bearings and the like are provided on both sides in the rotation axis direction. The throttle valve is integrally coupled to a shaft 1 that extends straight in the direction of the rotation axis. Further, the rotation angle of the throttle valve is changed within the operating angle range from the fully closed position that minimizes the intake air amount to the fully open position that maximizes the intake air amount. Controls the intake air amount (intake amount).

  The shaft 1 is a valve shaft that rotates integrally with the throttle valve. Both end portions in the axial direction of the shaft 1 are rotatably accommodated in bearing portions on both sides of the cylindrical portion of the throttle body. One end portion of the shaft 1 in the rotation axis direction passes through the cylindrical portion of the throttle body and protrudes outside the throttle body. Further, the other end portion of the shaft 1 in the rotation axis direction penetrates the cylindrical portion of the throttle body and protrudes outside the throttle body. An accelerator lever to which a wire cable linked to a throttle operating part such as a throttle lever or a throttle handle is attached is fixed to the other end of the shaft 1 in the rotation axis direction by caulking or the like.

  The intake module of this embodiment converts the throttle opening corresponding to the rotation angle (valve opening) of the throttle valve that is driven to open (or close) according to the throttle operation amount of the driver into an electric signal. A non-contact type rotation angle detection device (throttle opening detection device) that outputs how much the throttle valve is opened to the ECU is mounted.

  The rotation angle detection device of the present embodiment detects a thin plate magnet (permanent magnet: hereinafter referred to as a magnet) 2 fixed to one end of the throttle valve shaft 1 in the rotation axis direction, and detects the magnetic flux emitted from the magnet 2. A rotation angle sensor (hereinafter referred to as a throttle opening sensor) 3 having a non-contact type magnetic detection element, and an open type yoke (open magnetic circuit type) for concentrating the magnetic flux emitted from the magnet 2 on the throttle opening sensor 3 And a casing that houses the throttle opening sensor 3 and the open type yoke.

  The open type yoke is composed of two divided first and second divided yokes 4 and 5, and is configured by combining one type of plate-shaped yoke. A magnetic flux detection gap for arranging the throttle opening sensor 3 is formed between the two first and second divided yokes 4 and 5. Here, the ECU of this embodiment opens the injector so that the fuel injection amount corresponding to the output of the throttle opening sensor 3, that is, the electric signal output from the throttle opening sensor 3, is supplied to the cylinder of the engine. The injection amount control for controlling the valve period is performed.

  The casing that houses the throttle opening sensor 3 and the open type yoke includes an intake module cover (sensor cover, magnetic shield cover) 11, a plate 12 fitted inside the intake module cover 11, and a cylindrical portion of the throttle body. It is comprised by the housing 14 etc. with which the outer wall surface is mounted | worn. The plate 12 and the housing 14 are formed with shaft through holes 15 and 16 penetrating in the direction of the rotation axis of the throttle valve shaft 1. For this reason, the magnet mounting portion of the shaft 1 of the throttle valve is formed in the bearing receiving hole formed in the bearing portion on one side of the cylindrical portion of the throttle body, the shaft through hole 16 formed in the housing 14, and the plate 12. In a state of penetrating through the shaft through hole 15 and protruding into the intake module cover 11 (for example, exposed in the sensor storage space 17), the intake module cover 11 is rotatably accommodated.

  The magnet 2 constitutes a magnet rotor that rotates relative to the throttle opening sensor 3 and the open type yoke. The magnet 2 rotates in accordance with the rotation of the throttle valve as a detection target. It is held and fixed at one end (magnet mounting portion) in the direction of the rotation axis. Specifically, the magnet 2 is held and fixed in a single-letter groove formed on the shaft 1 of the throttle valve using a fixing means such as an adhesive. The magnet 2 has a square shape (or a rectangular shape) as a planar shape. For example, a rare earth magnet such as a samarium-cobalt (Sm-Co) magnet or a neodymium (Nd) magnet, an alnico magnet, or a ferrite magnet is used. Is a cuboid-shaped permanent magnet that continues to generate stably.

  In the magnet 2 of this embodiment, the N pole and the S pole are magnetized so that the opposite ends of the plate length direction substantially orthogonal to the plate thickness direction and the plate width direction are opposite to each other. . Moreover, the magnet 2 is magnetized in parallel so that the directions of the magnetic lines of force inside the magnet are parallel to each other. The magnet 2 is magnetized in the radial direction perpendicular to the rotation axis (rotation center axis) of the shaft 1 of the throttle valve. Thereby, the magnetizing direction (plate length direction) of the magnet 2 coincides with the diameter direction perpendicular to the rotation axis of the shaft 1 of the throttle valve, and the magnet 2 is magnetized on one side in the plate length direction. The magnetic surface (magnetic pole surface) is an N pole, and the other magnetized surface (magnetic pole surface) in the plate length direction of the magnet 2 is an S pole.

  Here, the magnet 2 is used in an operating angle range from the fully closed position to the fully open position of the throttle valve with the rotation center as a center, and particularly inside the open type yoke (two first and second divided yokes 4). 5), and is rotatable in a magnet housing space 19 formed between the two. In the present embodiment, when the throttle valve is at the fully closed opening, the rotation angle of the magnet 2 becomes the minimum angle (for example, 0 deg) in the use angle range (detection angle range) of the throttle valve. Further, when the throttle valve is at the intermediate opening, the rotation angle of the magnet 2 becomes an intermediate angle (for example, 45 degrees) in the operating angle range of the throttle valve. Further, when the throttle valve is fully opened, the rotation angle of the magnet 2 becomes the maximum angle (for example, 90 deg) in the operating angle range of the throttle valve (see FIGS. 1B and 1C).

  The throttle opening sensor 3 of this embodiment is disposed in a magnetic flux detection gap formed between the two first and second divided yokes 4 and 5, and the magnetic flux (from the magnetized surface on one side of the magnet 2 ( It has a Hall IC that detects (density). The Hall IC is a non-contact type magnetic detecting element whose output changes according to the magnetic flux density passing through the magnetic flux detection gap (magnetic flux density interlinking the Hall IC), and amplifies the output of the Hall element An IC (integrated circuit) integrated with an amplification circuit that outputs a voltage signal corresponding to the magnetic flux density passing through the magnetic detection gap (magnetic flux density linked to the Hall IC). Note that the Hall IC may have a function of externally trimming a program for output gain adjustment, offset adjustment, and temperature characteristic correction with respect to magnetic flux density, or may have a self-diagnosis function of disconnection or short circuit.

  The Hall IC is sealed in a resin housing (sealing member) that constitutes a main body (weight) of the throttle opening sensor 3. In addition, the resin housing is formed in a rectangular parallelepiped shape (thin plate shape), and has both joint surfaces that are in close contact and joined to the two first and second divided yokes 4 and 5 on both sides in the plate thickness direction. Yes. A lead terminal group which is a sensor lead terminal group is drawn out from the resin housing containing the Hall IC. A lead terminal group of the throttle opening sensor 3 includes one output side lead terminal (sensor output terminal), one ground (GND) side lead terminal (sensor GND terminal), and one power source side lead terminal (sensor power source). Terminal).

  The throttle opening sensor 3 passes through the rotation center of the magnet 2 and has a magnetic flux detection gap so that the center of the Hall IC is positioned on a vertical line perpendicular to the rotation axis (rotation center axis) of the throttle valve shaft 1. Is arranged. That is, the throttle opening sensor 3 is disposed in the magnetic flux detection gap so that the rotation center of the magnet 2 and the center of the Hall IC are located on substantially the same axis.

  As a result, the Hall IC according to the present embodiment determines the rotation angle of the magnet 2 when the plate length direction (magnetization direction) of the magnet 2 and the magnetic flux detection gap coincide with each other on the straight line. (For example, 0 deg), and the rotation angle of the magnet 2 when the plate length direction (magnetization direction) of the magnet 2 and the magnetic flux detection gap are orthogonal to each other is set to an angle in the operating angle range (for example, 90 deg). When the rotation angle of 2 is 90 deg, the magnetic flux density passing through the magnetic flux detection gap becomes maximum, and the maximum output value in the operating angle range is output. When the rotation angle of the magnet 2 is 0 deg, the magnetic flux density passing through the magnetic flux detection gap Becomes the minimum, and the minimum output value in the working angle range is output.

  The throttle opening sensor 3 has both magnetosensitive surfaces on both sides in the plate thickness direction. The throttle opening sensor 3 is tilted by a predetermined inclination angle with respect to a vertical plane (vertical plane along the rotation axis) perpendicular to the rotation axis (rotation center axis) of the shaft 1 of the throttle valve. The magnetic flux detection gap is disposed. For this reason, the surface direction of both magnetosensitive surfaces of the throttle opening sensor 3 is set to a predetermined vertical plane (vertical plane along the rotation axis) perpendicular to the rotation axis (rotation center axis) of the shaft 1 of the throttle valve. It is inclined to intersect at the intersection angle.

The open type yoke of the present embodiment is composed of two divided first and second divided yokes (divided portions) 4 and 5, and one type of thin plate-shaped yoke is replaced with a magnet accommodating space (magnet accommodating space). 19 are combined so as to face each other.
The two first and second divided yokes 4 and 5 are formed in a predetermined shape by a magnetic material such as iron, and the magnetic flux emitted from the magnet 2 is converted into a throttle opening sensor 3, particularly a Hall IC (non-contact type). It is a set of plate-like yokes (magnetic bodies) for concentrating on the magnetic detection element. These first and second divided yokes 4 and 5 are symmetrical yoke bodies 21 and 22 that are open on one side, and a yoke that sandwiches the throttle opening sensor 3 from both sides in the thickness direction of the throttle opening sensor 3. Upper and lower pieces (folded pieces) 31 and 32 are provided.

The two first and second divided yokes 4 and 5 are arranged so that one end faces in the plate thickness direction face each other with the magnet 2 and the throttle opening sensor 3 sandwiched therebetween.
The first and second divided yokes 4 and 5 have the end portions on the tip side (open side) of the yoke bodies 21 and 22 (magnet side end: yoke open end portion 23) dimensioned in the plate width direction. Constitutes the largest maximum width portion. Further, the two first and second divided yokes 4 and 5 are configured such that the end portions on the tip side of the yoke upper and lower pieces 31 and 32 (end portion on the throttle opening sensor side: the tip portion of the sensor mounting portion 33) are plates. The minimum width portion having the smallest dimension in the width direction is formed. The plate width dimension (A) of the minimum width portion is at least a plate width dimension equal to or greater than the plate thickness dimension (B) of the magnet 2.
The two first and second divided yokes 4 and 5 are gradually reduced stepwise or continuously from the yoke open end 23 toward the tip of the sensor mounting portion 33. That is, it is formed to be tapered (so that the magnetic flux converges from the yoke open end portion 23 toward the tip of the sensor mounting portion 33 or the magnetic flux detection gap).

  Each yoke body 21, 22 formed for each of the two first and second divided yokes 4, 5 has a central axis line (reference line) connecting the rotation center of the magnet 2 and the center of the throttle opening sensor 3 in the plate thickness direction. ) And a plane including the rotation axis of the shaft 1 of the throttle valve so as to be plane-symmetrical. Each yoke body 21, 22 forms a predetermined air gap between the yoke 2 and is disposed opposite to each other. The yoke bodies 21 and 22 are opposed to each other with a non-circular magnet housing space (magnet housing space) 19 in which one end of the throttle valve shaft 1 in the rotational axis direction and the magnet 2 are rotatably housed. Yes.

  And each yoke main body 21 and 22 formed for every two 1st, 2nd division | segmentation yokes 4 and 5 is mutually opposingly arrange | positioned on the opposite side (throttle opening sensor side) with respect to an open side. A flat plate-shaped yoke facing portion 24 and a flat plate-shaped linear portion 25 bent toward the magnet 2 with respect to the surface direction of the yoke facing portion 24 are provided. A yoke facing portion 24 of each yoke body 21, 22 is a rectangular flat plate parallel to a radial vertical line perpendicular to the rotation axis of the shaft 1 of the throttle valve, on one side in the plate width direction. The yoke upper and lower pieces 31, 32 are connected to one end edge.

  The straight portion 25 of each yoke body 21, 22 has a flat yoke open end 23 on the open side. The yoke open end 23 is provided on the open side of each yoke body 21, 22, and is near the maximum angle (for example, near 90 deg) in the operating angle range of the throttle valve (both ends of the magnet 2 in the magnetization direction) This is a magnet facing portion that forms a minimum air gap with the magnetized surface. Further, the linear portion 25 of each yoke body 21, 22 has a predetermined inclination angle with respect to a vertical line in the radial direction perpendicular to the rotation axis of the shaft 1 of the throttle valve from the yoke open end portion 23 toward the yoke facing portion 24. It is only inclined and extends straight. Further, the linear portion 25 is inclined such that the gap between the yoke facing portions 24 is larger than the gap between the yoke open end portions 23. That is, each of the yoke bodies 21, 22, particularly the linear portion 25, forms air between the magnet 2 when the magnet 2 rotates to the minimum angle side from the maximum angle that forms the minimum air gap with the magnet 2. It is inclined so that the gap gradually increases.

  The yoke upper and lower pieces 31 and 32 formed for each of the two first and second divided yokes 4 and 5 are bent at a predetermined bending angle (an obtuse angle larger than a right angle) with respect to the yoke bodies 21 and 22. ing. The yoke upper and lower pieces 31 and 32 are arranged in the plate width direction of the yoke facing portion 24 of the yoke bodies 21 and 22 through a bent portion 34 that is bent in an approximately V (or approximately U) shape with an obtuse angle larger than a right angle. It is connected to one end edge (a different side for each of the two first and second divided yokes 4, 5). Further, the yoke upper and lower pieces 31 and 32 are straight lines extending straight from the bent portion 34 toward the tip of the sensor mounting portion 33 with an inclination with respect to a vertical line perpendicular to the surface direction of the yoke main bodies 21 and 22. A portion 35 is provided. Further, a sensor mounting portion (yoke facing portion) 33 is provided on the front end side of the linear portion 35 so as to be opposed to each other with a magnetic flux detection gap therebetween.

  Each of the yoke upper and lower pieces 31 and 32 has a protruding piece projecting from one end edge in the plate width direction of each yoke facing portion 24 to one side in the plate width direction, and the vicinity of one end edge in the plate width direction of each yoke facing portion 24. Thus, it is formed by bending the throttle opening sensor side (one side in the plate thickness direction). The bending angle of the yoke upper and lower pieces 31 and 32 with respect to the yoke bodies 21 and 22 is set to an angle that allows the throttle opening sensor 3 to fall within the plate width dimension of the yoke bodies 21 and 22. Further, the yoke upper and lower pieces 31 and 32 with respect to the yoke main bodies 21 and 22 are set at substantially the same angle. Each of the yoke upper and lower pieces 31 and 32 is used as an abutment surface in which the opposing surface of the sensor mounting portion 33 is in direct contact with both magnetic sensing surfaces of the throttle opening sensor 3. The sensor mounting portion 33 has a function as a sensor holding portion that holds and fixes the throttle opening sensor 3 with, for example, an adhesive or the like in a state where the throttle opening sensor 3 is sandwiched from both sides in the plate thickness direction. Yes.

  Here, the sensor mounting portion 33 of the yoke upper piece 31 arranged on the upper side in FIG. 1B is in close contact with or in contact with the magnetic sensing surface on one side of the throttle opening sensor 3. 3 constitutes a sensor upper side mounting portion that holds the throttle opening degree sensor 3 so as to be depressed from the upper side in the thickness direction of the figure. In addition, the sensor mounting portion 33 of the yoke lower piece 32 disposed on the lower side in FIG. 1B is in close contact with or in contact with the magnetic sensing surface on the other side of the throttle opening sensor 3. 3 constitutes a sensor lower side mounting portion that holds the throttle opening sensor 3 so as to be depressed from the lower side in the thickness direction of the figure.

  The magnetic flux detection gap is a gap having a constant width formed between the sensor mounting portions 33 of the yoke upper and lower pieces 31 and 32 formed for each of the two first and second divided yokes 4 and 5. In this magnetic flux detection gap, the throttle opening sensor 3 is arranged so that the rotation center of the magnet 2 and the center of the Hall IC in the plate thickness direction are located on the same axis. The magnetic flux detection gap is provided in the middle of the magnetic circuit constituted by the magnet 2, the throttle opening sensor 3, and the two first and second divided yokes 4 and 5.

  The intake module cover 11 is formed in a container shape from a magnetic material (for example, an iron-based metal material containing 80% nickel). The intake module cover 11 forms a sensor accommodation space 17 between the upper end surface of the plate 12 in the figure. The intake module cover 11 is integrally formed with a cylindrical wall portion (side wall portion) 41 so as to surround the periphery of the plate 12. The housing side (the lower side in the drawing in FIG. 1A) of the cylindrical wall portion 41 is closed by the plate base portion of the plate 12. Further, the side opposite to the housing side of the cylindrical wall portion 41 (the upper side in the drawing in FIG. 1A) is closed by a top wall plate (upper wall portion) 42 that covers the upper layer portion of the sensor housing space 17. . Further, the cylindrical wall portion 41 of the intake module cover 11 is provided with an opening portion that opens toward the outside. A connector formed integrally with the plate 12 is fitted into the opening to be held and fixed.

  Here, the inside of the air intake module cover 11 assembled with the plate 12 and the connector, that is, the sensor housing space 17 is filled with an epoxy-based thermosetting resin (electrically insulating mold resin). The thermosetting resin includes lead terminals of the lead terminal group of the throttle opening sensor 3, connector terminals of the connector terminal group of the connector, lead terminals of the lead terminal group of the throttle opening sensor 3, and connector terminal group of the connector. A sealing member (potting agent) that seals a plurality of conductors (conductor (copper wire) provided with an insulating film, conductive plate or the like) that electrically connects each of the connector terminals.

  The cylindrical wall portion 41 of the intake module cover 11 is provided with two concave portions (locking portions) 43 and 44 that protrude toward the central portion side of the sensor housing space 17. These concave portions 43 and 44 are arranged in parallel to the forming direction of the two sensor holding portions 51 and 52 formed integrally with the plate 12. And the two recessed parts 43 and 44 increase the contact area of a thermosetting resin and the cylinder wall part 41 of the intake module cover 11, and the thermosetting resin and thermosetting resin with a difference in a linear expansion coefficient are provided. The linear expansion movement of the electrical component sealed inside is suppressed.

  Instead of the two concave portions 43 and 44, the cylindrical wall portion 41 of the intake module cover 11 may be driven out to provide a plurality of convex portions on the cylindrical wall portion 41 of the intake module cover 11. In addition, a locking portion such as a recess (or a convex portion) that locks the thermosetting resin so that the linear expansion movement of the thermosetting resin is difficult to increase by increasing the contact area with the thermosetting resin, the sensor You may provide in cyclic | annular form so that the perimeter of the storage space 17 may be surrounded. In this case, for example, locking portions such as concave portions (or convex portions) may be provided at predetermined intervals in the circumferential direction. Further, as shown in FIG. 2, it is not necessary to provide a locking portion on the cylindrical wall portion 41 of the intake module cover 11.

  The plate 12 is integrally formed of a nonmagnetic material (for example, a resin material such as a thermoplastic resin). The plate 12 includes a plate base portion that is installed in close contact with the upper end surface of the housing 14 in the figure, and plate thick portions 53 and 54 that are thicker than the plate base portion. The plate thick portions 53 and 54 have convex sensor holding portions (yoke holding portions) 51 and 52 disposed so as to protrude upward in the drawing from the reference plane passing through the upper end surface of the plate base portion. is doing. These sensor holding parts 51 and 52 are recessed groove-shaped fittings that hold the respective yoke bodies 21 and 22 formed by the two first and second divided yokes 4 and 5 by press-fitting or the like. Grooves 61 and 62 are provided. The yoke bodies 21 and 22 formed for the two first and second divided yokes 4 and 5 may be supported and fixed in the fitting grooves 61 and 62 using an adhesive or the like. A shaft through hole 15 is formed between the plate base portion of the plate 12, particularly between the two sensor holding portions 51 and 52.

  One side of the plate 12 is a connector housing (hereinafter referred to as a connector) in which connector terminal groups provided corresponding to the lead terminal groups drawn from the main body (resin housing) of the throttle opening sensor 3 are concentrated. (Abbreviated: see FIG. 3) 13 is formed integrally. This connector 13 has a terminal block for holding a group of connector terminals, and a rectangular tubular connector shell provided on the outside of the terminal block, and a throttle opening mounted on the ECU-side wire harness and the plate 12. This is a device for connecting the degree sensor 3.

The housing 14 is a die-cast product or an aluminum casting made of an aluminum alloy mainly composed of aluminum, and is formed in a predetermined shape by the aluminum alloy. The housing 14 has a function as a bracket for mounting the plate 12 and the intake module cover 11 on the outer wall surface of the cylindrical portion of the throttle body. A plate 12 is mounted on the upper end surface (housing upper end surface) of the housing 14 in the figure. Further, a shaft through hole 16 is formed in the housing 14. The housing 14 is integrally formed with a flange portion 63 to which the cylindrical wall portion 41 of the intake module cover 11 is caulked and fixed.
In the present embodiment, the intake module cover 11 is in a state where the coupling end surface (inner circumferential surface) of the cylindrical wall portion 41 of the intake module cover 11 and the coupling end surface (outer circumferential surface) of the flange portion 63 of the housing 14 are in surface contact. 14 is fixed by using a connecting means such as caulking.

[Operation of Example 1]
Next, the operation of the intake module provided with the rotation angle detection device of the present embodiment will be briefly described with reference to FIGS.

  When a driver operates a throttle operating part such as a throttle lever or a throttle handle, an accelerator lever connected to the throttle operating part via a wire cable rotates. Along with this, the throttle valve rotates around the axis (rotary axis) of the shaft 1 in accordance with the throttle operation amount of the driver. As a result, the throttle bore communicating with the combustion chamber of the engine is opened, so that the engine rotation speed is changed to a speed corresponding to the throttle operation amount of the driver.

Here, when the engine is idling, that is, when the throttle valve is fully closed, the rotation angle of the magnet 2 becomes the minimum angle (for example, 0 deg) in the operating angle range of the throttle valve. In this case, the axis of the magnet 2 in the plate length direction and the central axis of the throttle opening sensor 3 in the plate thickness direction are positioned on a straight line.
In this case, a magnetic pole (for example, N pole or S pole) on one side in the magnetizing direction (plate length direction) of the magnet 2 → yoke upper piece 31 (straight part 35 → bending part 34) → first part of the first divided yoke 4 The yoke main body 21 of the one-division yoke 4 (yoke facing portion 24 → linear portion 25 → yoke open end portion 23) → magnetic pole on the other side of the magnet 2 magnetizing direction (plate length direction) (for example, S pole or N pole) In this path, a magnetic circuit is formed in which the magnetic flux emitted from the magnetic pole surface of the magnet 2 flows. Further, the N pole (or S pole) of the magnet 2 → the yoke lower piece 32 of the second divided yoke 5 (the straight portion 35 → the bent portion 34) → the yoke body 22 (the yoke facing portion 24 → the straight portion) of the second divided yoke 5. 25 → Yoke open end 23) → Magnetic circuit through which the magnetic flux from the magnetic pole surface of the magnet 2 flows is formed in the path of the S pole (or N pole) of the magnet 2.
At this time, since the magnetic flux emitted from the magnetic pole on one side in the magnetizing direction (plate length direction) of the magnet 2 does not pass through the magnetic flux detection gap, the output of the Hall IC of the throttle opening sensor 3 with respect to the rotation angle of the magnet 2. Is the minimum output value (approximately 0 (zero)) in the operating angle range of the throttle valve.

Further, when the driver operates the throttle operating component and the throttle valve is opened to an intermediate opening between the fully closed position and the fully opened position, the rotation angle of the magnet 2 is changed to an intermediate angle (for example, an operating angle range of the throttle valve). 45 deg). That is, the magnet 2 is rotated counterclockwise in FIGS. 1B and 2B from the state of the rotation angle 0 deg around the rotation center by 45 deg, so that the rotation angle of the magnet 2 is 45 deg. At this time, the magnetic flux density passing through the magnetic flux detection gap (the magnetic flux density interlinking with the Hall IC) is relatively medium with respect to the magnetizing direction (plate length direction) of the magnet 2.
In this case, the path of the N pole (or S pole) of the magnet 2 → the yoke body 21 of the first divided yoke 4 (the straight portion 25 → the yoke open end 23) → the S pole (or N pole) of the magnet 2. A magnetic circuit is formed in which the magnetic flux emitted from the magnetic pole surface of the magnet 2 flows. Further, the N pole (or S pole) of the magnet 2 → the yoke body 21 of the first divided yoke 4 (straight portion 25 → yoke facing portion 24) → the yoke upper piece 31 (the bent portion 34 → the straight portion) of the first divided yoke 4. 35 → sensor mounting part 33) → magnetic flux detection gap (throttle opening sensor 3) → yoke lower piece 32 of second split yoke 5 (sensor mounting part 33 → straight line part 35 → bending part 34) → second split yoke 5 A magnetic circuit is formed in which the magnetic flux from the magnetic pole surface of the magnet 2 flows through the path of the yoke body 22 (yoke facing portion 24 → linear portion 25 → yoke open end portion 23) → S pole (or N pole) of the magnet 2. The
Thereby, the output of the Hall IC of the throttle opening sensor 3 with respect to the rotation angle of the magnet 2 becomes an intermediate output value between the minimum output value and the maximum output value in the use angle range of the throttle valve.

Further, when the driver operates the throttle operating component and the throttle valve is opened to the fully open position, the rotation angle of the magnet 2 becomes the maximum angle (for example, 90 deg) in the operating angle range of the throttle valve. That is, the magnet 2 is rotated counterclockwise in FIG. 1 (b) and FIG. 2 (b) from the state of the rotation angle of 45 deg around the rotation center to set the rotation angle of the magnet 2 to 90 deg. At this time, the axial direction of the magnet 2 in the plate length direction and the central axis of the throttle opening sensor 3 in the plate thickness direction are orthogonal to each other (see FIGS. 1B and 1C).
In this case, the N pole (or S pole) of the magnet 2 → the yoke body 21 of the first divided yoke 4 (yoke open end 23 → linear portion 25 → yoke facing portion 24) → on the yoke of the first divided yoke 4 Piece 31 (bending portion 34 → linear portion 35 → sensor mounting portion 33) → magnetic flux detection gap (throttle opening sensor 3) → yoke lower piece 32 of second split yoke 5 (sensor mounting portion 33 → linear portion 35 → bending portion) 34) → the yoke body 22 of the second divided yoke 5 (the yoke facing portion 24 → the linear portion 25 → the yoke open end portion 23) → the S pole (or N pole) of the magnet 2 is projected from the magnetic pole surface of the magnet 2. A magnetic circuit through which the magnetic flux flows is formed.
As a result, most of the magnetic flux emitted from the magnetic pole surface of the magnet 2 passes through the magnetic flux detection gap, so that the output of the Hall IC of the throttle opening sensor 3 with respect to the rotation angle of the magnet 2 is the maximum in the operating angle range of the throttle valve. Output value.

Accordingly, the magnetic flux density passing through the magnetic flux detection gap (the magnetic flux density linked to the Hall IC) changes with the change of the rotation angle of the magnet 2, and the Hall IC changes with the change of the magnetic flux density linked to the Hall IC. The output changes. Thus, the throttle opening degree corresponding to the rotation angle of the throttle valve is detected by the throttle opening degree sensor 3 using the output change characteristic of the Hall IC with respect to the rotation angle of the magnet 2.
Then, the ECU that receives the electric signal (throttle opening signal) output from the Hall IC of the throttle opening sensor 3 controls the control target values (fuel injection timing, fuel injection amount, etc.) required for the electronically controlled fuel injection device. Is calculated.

  For example, the ECU detects an intake pipe pressure downstream of the throttle valve with an intake pressure sensor, and indirectly calculates the intake air amount. From the calculated intake air amount and the measured engine speed, The basic injection time (basic injection amount) is calculated. Then, a final injection time (fuel injection amount, target injection amount) is determined by adding a correction amount (injection amount correction amount) corresponding to the output value of the Hall IC of the throttle opening sensor 3 to the basic injection time. In addition, the ECU optimizes the fuel injection timing (timing, target injection timing) and the fuel injection amount so that the fuel injection is completed before the engine intake process.

[Effect of Example 1]
As described above, in the rotation angle detection device of the present embodiment, the throttle opening degree sensor 3 is constituted by the yoke upper and lower pieces 31 and 32 formed for each of the two first and second divided yokes 4 and 5 of the open type yoke. Is sandwiched from both sides in the thickness direction. That is, the sensor mounting portion 33 of the yoke upper piece 31 of one of the two first and second divided yokes 4, 5 and the sensor of the yoke lower piece 32 of the other second divided yoke 5. By sandwiching the main body (resin housing) of the throttle opening sensor 3 with the mounting portion 33, both the magnetic sensitive surfaces of the throttle opening sensor 3 and the two first and second divided yokes 4 and 5 are formed. Since there is no gap between the opposing surfaces of the yoke upper and lower pieces 31 and 32, it is not necessary to manage the gap with high accuracy. As a result, there is no variation in gaps between products, so that variation in characteristics between products can be eliminated. That is, since the output change characteristic of the Hall IC with respect to the rotation angle of the magnet 2 can be stabilized, variations in detection accuracy among products can be suppressed.

  Further, the throttle opening degree sensor 3 determines the bending angle of the yoke upper and lower pieces 31 and 32 with respect to the yoke bodies 21 and 22 formed for each of the two first and second divided yokes 4 and 5, and the throttle opening sensor 3 detects the yoke bodies 21 and 22. By setting the angle to be within the plate width dimension and setting the obtuse angle to be greater than the right angle, it is possible to suppress an increase in the plate width dimension of the product. Thereby, the mounting space of a product can be ensured easily. Further, the two first and second divided yokes 4 and 5 are arranged such that the end portions (open side) of the yoke bodies 21 and 22 (magnet side end: yoke open end portion 23) are in the plate width direction. The maximum width portion having the largest dimension is configured. Further, the two first and second divided yokes 4 and 5 are configured such that the end portions on the tip side of the yoke upper and lower pieces 31 and 32 (end portion on the throttle opening sensor side: the tip portion of the sensor mounting portion 33) are plates. The minimum width portion having the smallest dimension in the width direction is formed. The plate width dimension of the minimum width portion is at least a plate width dimension equal to or greater than the plate thickness dimension of the magnet 2. Thereby, since the magnetic flux emitted from the magnet 2 can be efficiently concentrated on the throttle opening sensor 3, particularly the Hall IC, it can be efficiently linked to the Hall IC, so that the output of the Hall IC increases. .

  Then, the thin plate-like throttle opening sensor 3 is tilted within the plate width dimension (within the yoke height dimension) of the yoke open end 23 which is the maximum width portion of the two first and second divided yokes 4 and 5. Parts (plate-like) constituting an open type yoke by matching the bending angles of the yoke upper and lower pieces 31 and 32 with respect to the yoke bodies 21 and 22 formed for each of the two first and second divided yokes 4 and 5. York) can be made common. That is, by composing an open type yoke (two first and second divided yokes 4 and 5) by combining one type of plate-like yoke (magnetic material), it is possible to share parts. Cost can be reduced.

The two first and second divided yokes 4 and 5 are gradually reduced stepwise or continuously from the yoke open end 23 toward the tip of the sensor mounting portion 33. That is, it is formed to be tapered (so that the magnetic flux converges from the yoke open end portion 23 toward the tip of the sensor mounting portion 33 or the magnetic flux detection gap). Thereby, even if the size of the throttle opening sensor 3 is small, for example, the magnetic flux emitted from the magnetized surface (magnetic pole surface) of the magnet 2 can be efficiently guided to the throttle opening sensor 3, particularly the Hall IC. That is, the magnetic flux emitted from the magnetized surface (magnetic pole surface) of the magnet 2 can be concentrated on the throttle opening sensor 3, particularly the Hall IC. For this reason, since it can be efficiently linked to the Hall IC, the output of the Hall IC is increased.
Therefore, the minimum physique design of the product comprising the throttle opening sensor 3 and the open type yoke is possible.

  Further, in the rotation angle detecting device of the present embodiment, the intake module cover 11 that forms the sensor housing space 17 between the upper end surface of the plate base portion of the plate 12 is formed of a magnetic material (iron-based metal material). is doing. Thus, even if an external magnetic field (for example, an alternator) and a magnetic body (iron-based screw) are installed in a state of being close to the rotation angle detecting device, the external magnetic field and the magnetic body are formed by the intake module cover 11 made of a magnetic body. Can absorb magnetism. As a result, the throttle opening sensor 3, particularly the Hall IC, is less susceptible to the influence of the external magnetic field and the magnetic material, and is reduced, and the change in the Hall IC output change characteristic with respect to the rotation angle of the magnet 2 can be suppressed. it can. That is, the quality of the product can be improved.

Further, in the rotation angle detection device of the present embodiment, the intake module cover 11 is manufactured from a magnetic material having a low electrical resistance, and the housing 14 is manufactured from an aluminum alloy having a low electrical resistance. Further, the volume of the housing 14 is made larger than that of the intake module cover 11. The coupling end surface (inner peripheral surface) of the cylindrical wall portion 41 of the intake module cover 11 and the coupling end surface (outer peripheral surface) of the flange portion 63 of the housing 14 are brought into surface contact.
Thus, the radio wave noise that has reached the intake module cover 11 is released from the coupling end surface of the cylindrical wall portion 41 of the intake module cover 11 having a small electrical resistance to the flange portion 63 of the housing 14 having a large volume. 3. In particular, the Hall IC is not easily affected by radio noise, and the change in the output change characteristic of the Hall IC with respect to the rotation angle of the magnet 2 can be minimized. That is, the quality of the product can be improved.

  Further, in the rotation angle detection device of the present embodiment, the air intake module cover 11 is secured by caulking and fixing the flange portion 63 of the aluminum alloy housing 14 with the cylindrical wall portion 41 of the air intake module cover 11 having a small linear expansion coefficient. The linear expansion movement of the epoxy-based thermosetting resin filled in the inside can be suppressed. Further, in the rotation angle detection device of the present embodiment, two concave portions 43 and 44 projecting toward the center side of the sensor housing space 17 are formed in the cylindrical wall portion 41 of the intake module cover 11. As a result, the epoxy-based thermosetting resin filled in the intake module cover 11 is restrained by the two recesses 43 and 44, and therefore, the throttle opening sensor 3 sealed with the thermosetting resin and the opening. The linear expansion movement of the internal parts such as the mold yoke can be minimized.

This can stabilize the output change characteristic of the Hall IC with respect to the rotation angle of the magnet 2, thereby suppressing variation in detection accuracy between products.
Further, since it is possible to prevent a conduction failure such as disconnection of a plurality of conductors that electrically connect the lead terminal group of the throttle opening sensor 3 and the connector terminal group of the connector 13, the reliability of the throttle opening sensor 3 can be prevented. Can be improved. That is, the quality of the product can be improved.
Further, each lead of the lead terminal group of the throttle opening sensor 3 by peeling of the thermosetting resin from a plurality of conductors that electrically connect the lead terminal group of the throttle opening sensor 3 and the connector terminal group of the connector 13. Occurrence of a phenomenon (migration) that reduces electrical insulation between terminals, between a plurality of conductors, and between connector terminals of the connector terminal group of the connector 13 can be prevented.

[Configuration of Example 2]
3 to 5 show a second embodiment of the present invention, FIG. 3 is a view showing an intake module provided with a rotation angle detecting device, FIG. 4 is a view showing an intake air temperature sensor, and FIG. FIG. 4 is a view showing an intake pressure sensor.

  The intake module of the present embodiment includes an intake air supplied into the combustion chamber of the engine, in addition to a rotation angle detection device (see Embodiment 1) constituted by a magnet 2, a throttle opening sensor 3, an open type yoke, and the like. An intake air temperature sensor 6 that converts the temperature (intake air temperature) into an electric signal and outputs it to the ECU, and an intake air pressure that converts the pressure (intake air pressure) of the intake air supplied into the combustion chamber of the engine into an electric signal and outputs it to the ECU An atmospheric pressure sensor 7 is mounted.

The intake air temperature sensor 6 has a temperature detection element such as a thermistor whose resistance value changes in response to a change in intake air temperature. Further, the intake air temperature sensor 6 has a thermistor portion 71 which is disposed so that the front end portion is exposed inside the intake passage and has a thermistor sealed in an epoxy resin. A pair of terminals 73 are sealed in a resin housing (sealing member) 72 constituting the main body of the intake air temperature sensor 6, and a thermistor is fixed (electrically connected) between these terminals. The ends opposite to the thermistor side of the pair of terminals 73 are drawn out from the resin housing 72 as lead terminal groups.
The lead terminal group includes one output side lead terminal (temperature sensor output terminal) connected to the output side of the thermistor and one power source side lead terminal (temperature sensor power supply terminal) connected to the power source side of the thermistor.

The intake pressure sensor 7 includes a pressure detection element such as a piezoresistive element that converts intake pressure introduced from an air introduction passage (sensing port) into an electric signal, and an amplification circuit that amplifies the electric signal output from the pressure detection element. Etc. have a pressure detection circuit. The pressure detection element and the pressure detection circuit are sealed in a resin housing (sealing member) 74 that constitutes the main body of the intake pressure sensor 7. A lead terminal group is drawn out from the resin housing 74 containing the pressure detection element and the pressure detection circuit.
The lead terminal group includes one ground (GND) side lead terminal (pressure sensor GND terminal) connected to the ground terminal of the pressure detection circuit and one output side lead terminal (pressure sensor output) connected to the output terminal of the pressure detection circuit. Terminal) and one power supply side lead terminal (pressure sensor power supply terminal) connected to the power supply terminal of the pressure detection circuit.

  Further, in the intake module cover 11 of the present embodiment, there is a main body portion of the rotation angle detection device (the yoke main bodies 21 and 22 formed for the two first and second divided yokes 4 and 5 of the open type yoke). ), A plate 12 for holding and fixing the main body portions of the intake air temperature sensor 6 and the intake pressure sensor 7 is fitted. On the side portion of the plate 12, connector terminal groups provided corresponding to the lead terminal groups drawn from the main body portions (resin housings) of the throttle opening sensor 3, the intake air temperature sensor 6, and the intake pressure sensor 7 are provided. One connector 13 arranged in a concentrated manner is integrally formed. Note that an opening 45 that opens to the outside is provided in the cylindrical wall portion 41 of the intake module cover 11.

  The connector 13 is liquid-tightly fitted into the opening 45 of the cylindrical wall portion 41 so as to protrude outward from the outer wall surface of the cylindrical wall portion 41 of the intake module cover 11. The connector 13 has a terminal block for holding a group of connector terminals, and a rectangular tubular connector shell provided outside the terminal block, and a throttle mounted on the ECU-side wire harness and the plate 12. It is a device that connects the opening sensor 3, the intake air temperature sensor 6, and the lead terminal group of the intake pressure sensor 7.

The connector terminal group includes five first to fifth connectors electrically connected to each lead terminal of the lead terminal group of the throttle opening sensor 3, the intake air temperature sensor 6, and the intake pressure sensor 7 through a plurality of conductors. It consists of terminals (sensor side connector terminal, external connection terminal, terminal).
The first connector terminal is electrically connected to the output side lead terminal of the lead terminal group of the intake air temperature sensor 6. The second connector terminal is electrically connected to the output side lead terminal of the lead terminal group of the throttle opening degree sensor 3. The third connector terminal is electrically connected to the GND side lead terminal of the lead terminal group of the intake pressure sensor 7, and is electrically connected to the GND side lead terminal of the lead terminal group of the throttle opening degree sensor 3. The fourth connector terminal is electrically connected to the output side lead terminal of the lead terminal group of the intake pressure sensor 7. The fifth connector terminal is electrically connected to the power supply side lead terminal of the lead terminal group of the intake air temperature sensor 6, is electrically connected to the power supply side lead terminal of the lead terminal group of the intake pressure sensor 7, and the throttle opening degree The sensor 3 is electrically connected to the power supply side lead terminals of the lead terminal group.

  Here, the interior of the intake module cover 11, that is, the sensor housing space 17, is filled with an epoxy-based thermosetting resin as in the first embodiment. The thermosetting resin includes lead terminals of the lead terminal group of the throttle opening sensor 3, lead terminals of the lead terminal group of the intake air temperature sensor 6, lead terminals of the lead terminal group of the intake pressure sensor 7, and a plurality of conductors. A sealing member that seals each connector terminal of the connector terminal group of the connector 13.

  Here, the ECU includes a CPU that performs control processing and arithmetic processing, a storage device (memory such as ROM and RAM) that stores various programs and various data, an input circuit, an output circuit, and the like. A microcomputer having the structure is provided. When the ignition switch (not shown) is turned on (IG / ON), the ECU electronically controls the injector based on a control program or control logic stored in the memory. The ECU is configured to forcibly terminate the above-described control based on the control program or the control logic when the ignition switch is turned off (IG / OFF).

  The ECU includes a microcomputer built in the ECU after the A / D converter converts the sensor signals from the throttle opening sensor 3, the intake air temperature sensor 6 and the intake pressure sensor 7. It is comprised so that it may be input. The ECU also receives sensor signals from various sensors such as a crank angle sensor for detecting the rotation angle of the crankshaft of the engine and an intake air amount sensor for detecting the amount of intake air taken into the combustion chamber of the engine. After A / D conversion by the converter, it is configured to be input to a microcomputer built in the ECU.

[Operation of Example 2]
Next, the operation of the intake module incorporated in the engine intake pipe of this embodiment will be briefly described with reference to FIGS.

  When a driver operates a throttle operating component such as a throttle lever or a throttle handle, an accelerator lever connected to the throttle operating component via a wire cable rotates. When the accelerator lever rotates, the shaft 1 connected to the accelerator lever rotates. Along with this, the throttle valve rotates around the axis of the shaft 1 according to the throttle operation amount of the driver. As a result, an intake passage communicating with the combustion chamber of the engine is opened, so that the engine rotation speed is changed to a speed corresponding to the throttle operation amount of the driver. At this time, the ECU that has input sensor signals from various sensors such as the throttle opening sensor 3, the intake air temperature sensor 6, and the intake pressure sensor 7 calculates a control target value required for the electronically controlled fuel injection device.

  For example, the ECU detects the intake pipe pressure downstream of the throttle valve by the intake pressure sensor 7 and indirectly calculates the intake air amount. From the calculated intake air amount and the measured engine speed, Calculate the basic injection time. Then, a final injection time (fuel injection amount) is determined by adding correction amounts based on sensor signals from the intake air temperature sensor 6 and various sensors of the Hall IC to the basic injection time. In addition, the ECU optimizes the fuel injection timing (timing) and the fuel injection amount so that the fuel injection is completed before the intake process of the engine.

  FIGS. 6 to 10 show Example 3 of the present invention, FIG. 6 is a diagram showing the overall configuration of the intake module, and FIG. 7 is a diagram showing an opening for injecting a thermosetting resin, FIG. 8 is a diagram showing the main configuration of the intake module, and FIGS. 9 and 10 are diagrams showing the main configuration of the rotation angle detecting device.

The intake module of the present embodiment includes a rotation angle detection device including a magnet 2, a throttle opening sensor 3, an open yoke, and the like, and the temperature (intake air temperature) of intake air supplied into the combustion chamber of the engine as an electrical signal. An intake air temperature sensor 6 that converts and outputs to the ECU and an intake air pressure sensor 7 that converts the pressure (intake air pressure) of the intake air supplied into the combustion chamber of the engine into an electrical signal and outputs the electrical signal are mounted.
In addition, the plate 12 of this embodiment is formed with a resin injection port 57 for injecting an epoxy-based thermosetting resin (mold resin) 10 into the sensor housing space 17. Therefore, each lead terminal of the lead terminal group of the throttle opening sensor 3, each connector terminal of the connector terminal group of the connector 13, each lead terminal of the lead terminal group of the throttle opening sensor 3, and each connector of the connector terminal group of the connector 13 A plurality of conductors (conductors coated with an insulating film (copper wire), conductive plates, etc.) that are electrically connected to the terminals are injected into the sensor housing space 17 from the resin injection port 57 of the plate 12. The mold resin 10 is used for molding.

  The open type yoke of the present embodiment has a curved portion 26 bent in an arc shape on the magnet side in the middle of the yoke bodies 21 and 22 formed for each of the two first and second divided yokes 4 and 5. ing. In addition, an attachment portion 55 that is in contact with the upper end surface of the flange portion 63 of the housing 14 is integrally formed on the outer periphery of the cylindrical wall portion 41 of the intake module cover 11 or the plate base portion of the plate 12 of the present embodiment. . The attachment portion 55 of the intake module cover 11 or the plate 12 is fastened and fixed to the upper end surface of the flange portion 63 of the housing 14 by a fastening screw (for example, an iron-based magnetic body) 64. In addition, a convex cylindrical portion 56 that rotatably accommodates the magnet mounting portion of the shaft 1 of the throttle valve is integrally formed on the plate base portion of the plate 12. The cylindrical portion 56 is formed between the two plate thick portions 53 and 54 (yoke holding portions 51 and 52), and the magnet accommodating portion 19 that accommodates the magnet 2 rotatably is formed therein. In addition, 65 is a round hole-shaped through hole through which the fastening screw 64 passes.

  Here, in the rotation angle detection device of the present embodiment, a fastening screw (for example, an iron-based magnetic body) 64 is installed in the vicinity of the throttle opening sensor 3 and the two divided yokes 4 and 5. By forming the intake module cover 11 from a magnetic material (iron-based metal material), the intake module cover 11 made of a magnetic material can absorb the magnetic effect of the fastening screw (for example, an iron-based magnetic material) 64. it can. As a result, it becomes less susceptible to magnetic influence by the throttle opening sensor 3, in particular, the fastening screw (for example, iron-based magnetic body) 64 to the Hall IC, and the output change of the Hall IC with respect to the rotation angle of the magnet 2 is reduced. Changes in characteristics can be suppressed.

  FIG. 11 shows a fourth embodiment of the present invention, and FIG. 11 is a diagram showing a main configuration of the rotation angle detection device.

The open type yoke of the present embodiment is composed of two divided first and second divided yokes (divided portions) 4 and 5, and two types of plate-shaped yokes are separated from a magnet accommodating space (magnet accommodating space) 19. Combining them to face each other.
The two first and second divided yokes 4 and 5 are formed in a predetermined shape by a magnetic material such as iron, and the magnetic flux emitted from the magnet 2 is converted into a throttle opening sensor 3, particularly a Hall IC (non-contact type). It is a set of plate-like yokes (magnetic bodies) for concentrating on the magnetic detection element.

The first divided yoke 4 includes a yoke body 21 that is open on one side, and a yoke lower piece 91 that is bent at a predetermined bending angle with respect to the yoke body 21.
The yoke lower piece 91 of the first divided yoke 4 has an obtuse angle larger than a right angle and a bent portion 34 bent in a substantially V (or substantially U) shape in the plate width direction of the yoke facing portion 24 of the yoke body 21. Connected to one edge. Further, the yoke lower piece 91 of the first divided yoke 4 has a protruding piece protruding from one end edge in the plate width direction of the yoke facing portion 24 of the yoke body 21 to the one side in the plate width direction. It is formed by bending around the throttle opening sensor side (the magnetic sensitive surface on one side in the plate thickness direction) around the vicinity of one end edge in the direction. Accordingly, the sensor mounting portion (yoke facing portion) 33 of the first divided yoke 4 is formed on the back side of the yoke lower piece 91 of the first divided yoke 4.

The second divided yoke 5 has a yoke body 22 that is open on one side, and a yoke upper piece 92 that is bent at a predetermined bending angle with respect to the yoke body 22.
The yoke upper piece 92 of the second divided yoke 5 has one end edge in the plate width direction of the yoke facing portion 24 of the yoke body 22 via a bent portion 34 that is bent at a substantially right angle and substantially V (or substantially U) shape. It is connected to the same side as the first divided yoke 4). Further, the yoke upper piece 92 of the second divided yoke 5 has a protruding piece protruding from one end edge in the plate width direction of the yoke facing portion 24 of the yoke body 22 to the one side in the plate width direction. It is formed by bending so as to abut on the throttle opening sensor side (the magnetic sensitive surface on the other side in the plate thickness direction) around one end edge in the direction. Accordingly, the sensor mounting portion (yoke facing portion) 33 of the second divided yoke 5 is formed on the surface side of the yoke upper piece 92 of the second divided yoke 5.
Note that the sensor mounting portions 33 of the two first and second divided yokes 4 and 5 of the present embodiment have a plate width dimension smaller than the plate width of the bent portion 34.

[Modification]
In this embodiment, the rotation angle detection device of the present invention is applied to a throttle opening detection device that detects a throttle opening corresponding to the rotation angle of the throttle valve. However, the rotation angle detection device of the present invention is You may apply to the accelerator opening detection apparatus which detects the accelerator opening equivalent to the depression amount of a pedal. Further, the rotation angle detection device of the present invention can detect the rotation angle of a valve (a valve body of an air flow rate control valve such as an exhaust gas recirculation amount control valve) that opens and closes a fluid flow path formed in the housing. You may apply to an apparatus. Further, the rotation angle detection device of the present invention may be used for a throttle valve that is driven to open using a driving force of a power source such as an electric motor.

  In this embodiment, the plate-shaped (or columnar) magnet 2 is used as the magnet, but a thin needle-shaped or thin rod-shaped magnet may be used as the magnet. In particular, the thinner the both ends in the plate length direction that are magnetized so that their polarities are opposite to each other, the thinner the Hall IC output voltage linearity with respect to the rotation angle of the magnet 2 (the Hall IC output change characteristics). (Linearity) can be improved. The magnet 2 may be a resin magnet obtained by sintering polyamide resin (PA), Nd, Fe, or B powder. Further, an electromagnet that generates a magnetomotive force when energized may be used as the magnet. Moreover, you may use the magnet rotor comprised with a permanent magnet and a rotor core (magnetic body) as a magnet.

  In the present embodiment, 0 deg to 90 deg is employed as the use angle range of the detection object, but −45 deg to +45 deg, −90 deg to 0 deg, and the like may be employed as the use angle range of the detection object. In addition, the valve opening operation direction of the throttle valve is the left rotation direction in the figure centering on the rotation center of the magnet 2, but the valve opening operation direction of the throttle valve is the right rotation direction in the illustration centering on the rotation center of the magnet 2. It is also good. Further, the use angle range of the detection object may be larger than those in the first and second embodiments. In this case, 0 deg to 80 deg, −80 deg to +80 deg, or the like is used as the use angle range of the detection target.

(A)-(c) is the schematic which showed the whole structure of the rotation angle detection apparatus (Example 1). (A)-(c) is the schematic which showed the main structures of the rotation angle detection apparatus (Example 1). (Example 2) which is the schematic which showed the whole structure of the intake module. (Example 2) which is the perspective view which showed the intake temperature sensor. (Example 2) which is the perspective view which showed the intake pressure sensor. (Example 3) which is the perspective view which showed the whole structure of the intake module. (Example 3) which was the perspective view which showed the opening part for injection | pouring of a thermosetting resin. (Example 3) which is the perspective view which showed the main structures of the intake module. (Example 3) which is the perspective view which showed the main structures of the rotation angle detection apparatus. (Example 3) which is the front view which showed the main structures of the rotation angle detection apparatus. (Example 4) which is the perspective view which showed the main structures of the rotation angle detection apparatus. It is the front view which showed the whole structure of the rotation angle detection apparatus (conventional technique).

Explanation of symbols

1 Throttle valve (detection target) shaft 2 Magnet
3 Throttle opening sensor (rotation angle sensor)
4 First divided yoke (divided part of open type yoke, magnetic body)
5 Second divided yoke (divided part of open type yoke, magnetic body)
6 Intake air temperature sensor 7 Intake air pressure sensor 10 Mold resin (thermosetting resin)
11 Intake module cover 12 Plate 13 Connector 14 Housing 17 Sensor accommodation space 19 Magnet accommodation space (Magnet accommodation space)
21 yoke body of plate-shaped yoke 22 yoke body of plate-shaped yoke 23 open end of yoke of plate-shaped yoke 24 yoke-facing portion of plate-shaped yoke 31 upper yoke piece (folded piece) of plate-shaped yoke
32 Yoke lower piece (folded piece) of plate-shaped yoke
33 Sensor mounting portion of plate-shaped yoke 34 Bending portion of plate-shaped yoke 43 Convex portion (locking portion)
44 Convex part (locking part)
51 Sensor holding part (Yoke holding part)
52 Sensor holding part (Yoke holding part)

Claims (16)

(A) a magnet fixed to the rotating shaft of the detection object;
(B) having a magnetic detection element for detecting the magnetic flux emitted from the magnet;
A plate-like rotation angle sensor for detecting the rotation angle of the detection object using the output change characteristic of the magnetic detection element with respect to the rotation angle of the magnet;
(C) In a rotation angle detection device comprising a magnetic body that is open on one side, and an open type yoke for concentrating the magnetic flux emitted from the magnet on the rotation angle sensor,
The open type yoke is composed of two divided portions, and an air gap is formed between the two divided portions and the magnet, and the yoke main body and the yoke main body arranged opposite to each other. Plate-shaped bent pieces that are bent at a predetermined bending angle and arranged to face each other,
Each bent piece formed for each of the two divided portions includes a protruding piece protruding from one end edge in the plate width direction of one yoke body formed in each of the two divided portions to one side in the plate width direction. It is formed by bending at a predetermined bending angle in the plate thickness direction,
The rotation angle detection device, wherein the rotation angle sensor is sandwiched between the bent pieces formed for each of the two divided portions from both sides in the plate thickness direction. The rotation angle detection device according to claim 1,
In the open type yoke, the rotation angle sensor is arranged in a magnetic flux detection gap formed between the bent pieces. In the rotation angle detection device according to claim 1 or 2,
Each of the bent pieces is formed by bending a protruding piece projecting to one side in the plate width direction from one end edge in the plate width direction of each yoke body formed for each of the two divided portions toward the rotation angle sensor. A rotation angle detection device. The rotation angle detection device according to any one of claims 1 to 3,
The bending angle of each bending piece with respect to each yoke body formed for each of the two divided portions is set to an angle that allows the rotation angle sensor to be within the plate width dimension of each yoke body. Rotation angle detection device. In the rotation angle detection device according to any one of claims 1 to 4,
The rotation angle detecting device, wherein a bending angle of each bent piece with respect to each yoke body formed for each of the two divided portions is set to an obtuse angle larger than a right angle. In the rotation angle detection device according to any one of claims 1 to 5,
The rotation angle detection device according to claim 1, wherein the bending angle of each bent piece with respect to each yoke body formed for each of the two divided portions is set to be substantially the same angle. In the rotation angle detection device according to any one of claims 1 to 6,
The magnet is a plate magnet magnetized in the plate length direction,
The rotation angle detecting device, wherein the two divided portions have a plate width dimension that is at least equal to a plate thickness dimension of the plate magnet. In the rotation angle detection device according to any one of claims 1 to 7,
The rotation angle detector according to claim 2, wherein the two divided portions are formed such that the plate width gradually decreases from the end on the magnet side toward the end on the sensor side. The rotation angle detection device according to any one of claims 1 to 8,
The rotation angle sensor has both magnetosensitive surfaces in contact with the bent pieces on both sides in the plate thickness direction,
The rotation angle detection is characterized in that the surface directions of the two magnetosensitive surfaces of the rotation angle sensor are inclined so as to intersect a vertical plane perpendicular to the rotation axis of the detection object at a predetermined intersection angle. apparatus. In the rotation angle detection device according to any one of claims 1 to 9,
The rotation angle detection device, wherein the magnetic detection element is sealed in a sealing member constituting a main body of the rotation angle sensor.   The rotation angle detection device according to any one of claims 1 to 10, wherein the rotation angle sensor has a lead terminal group drawn out from the magnetic detection element. Rotation angle detection device. The rotation angle detection device according to any one of claims 1 to 11, wherein the rotation angle is between a plate having at least a yoke holding portion for holding and fixing the open type yoke, and the plate. A sensor and a cover forming a sensor housing space for housing the open type yoke,
The plate is made of a nonmagnetic material,
The rotation angle detector according to claim 1, wherein the cover is made of a magnetic material. The rotation angle detection device according to claim 12,
The rotation angle sensor has a lead terminal group led out from the magnetic detection element,
A rotation angle detecting device, wherein the inside of the cover is filled with a thermosetting resin and the lead terminal group is sealed. The rotation angle detection device according to claim 13,
The rotation angle detector according to claim 1, wherein the cover includes a locking portion that locks the thermosetting resin. The rotation angle detection device according to claim 13 or 14,
The plate has a connector in which connector terminal groups provided corresponding to the lead terminal groups of the rotation angle sensor are concentrated,
The rotation angle detecting device, wherein the thermosetting resin seals a plurality of conductors that electrically connect a lead terminal group of the rotation angle sensor and a connector terminal group of the connector. The rotation angle detection device according to any one of claims 12 to 15,
A housing for fixing the cover in surface contact;
The rotation angle detecting device, wherein the housing is made of a metal material mainly composed of aluminum.

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