JP2001194255A - Pressure sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure sensor which is attached to a passage member constituting the intake system of an engine, detects the intake pressure of the engine, and has a high degree of freedom for attaching direction regardless of the vertical direction of the member. SOLUTION: The pressure sensor 100 is provided with an attaching section 2 attached to the passage member 900, a projecting section 3 which projects in a direction which is almost perpendicular to the flowing direction of air from the internal wall to the inside of the member 900, a recessed section 4 formed on the front end face 3a of the projecting section 3. The sensor is also provided with a pressure detecting element 5 which is positioned in the passage member 900 in a state where the element 5 is housed in the recessed section 4. A through hole 6 is made through the side wall of the recessed section 4 to discharge the water collected in the section 40 into the member 900.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure sensor which is attached to a passage member through which a medium to be measured flows and detects the pressure in the passage member, and a throttle body having such a pressure sensor. The present invention can be applied to, for example, a device for measuring an internal pressure of an intake pipe or an exhaust pipe of an engine.

[0002]

2. Description of the Related Art For example, as a pressure sensor for detecting a pressure in an intake pipe of an engine, a semiconductor pressure sensor as shown in FIGS. 7A to 7C is generally used. These pressure sensors include a main body case J1, a semiconductor pressure detecting element (for example, a diaphragm type) J2 housed in the main body case J1, and a main body case J1 for guiding pressure to the pressure detecting element J2. And a pressure introduction port J3 formed to protrude.

These pressure sensors are attached to a passage member (intake manifold, surge tank, etc.) constituting an intake system of the engine so that a pressure introduction port J3 portion penetrates a wall of the passage member, and the pressure inside the passage member is reduced. From the port J3 to the pressure detecting element J2, and the pressure is detected by the pressure detecting element J2. Here, in order to prevent the adhesion of water and dirt entering from inside the passage member, the connection portions of the pressure detecting element J2 and the bonding wire J4 are covered with a protective member J5 made of resin such as gel.

[0004]

However, the above-described pressure sensor has a problem that the mounting direction of the sensor is restricted. For example, a pressure sensor (intake pressure sensor) directly mounted on an intake system such as an intake manifold
Then, there is a demand for space saving in relation to the appearance of the engine and the mounting space of the sensor.

In this case, as shown in the lower part of FIG. 8A, it is conceivable to attach a pressure sensor to the lower part of the passage member J6. However, the pressure introduction port J3 is necessarily directed upward. . And when the port J3 is upward,
As shown in FIG. 8B, water, dirt, and the like easily accumulate inside the sensor.

As described above, although the pressure detecting element J2 and its vicinity are covered and protected by the protective member J5,
If water or dirt adheres or adheres to these parts, it may cause a change in sensor characteristics, or in extreme cases, may cause a defect such as a broken bonding wire. Therefore, at present, as shown in the upper part of FIG. 8A, the pressure sensor has to be attached to the upper part of the passage member J6 so that at least the port J3 faces downward.

In view of the above problems, the present invention aims at reducing the space required for mounting a sensor in a pressure sensor which is mounted inside a passage member through which a medium to be measured flows and detects the pressure in the passage member. As a first object, and a second object is to increase the degree of freedom of the mounting direction regardless of the vertical direction of the passage member.
A third object is to provide a throttle body provided with such a pressure sensor.

[0008]

According to the present invention, since the conventional pressure sensor has a pressure introducing port in the first place, and the port is inserted into the passage member to attach the pressure introduction port to the passage member, the above-described structure is adopted. Since a problem arises, it has been made by paying attention to the configuration in which the pressure introduction port is eliminated.

According to the first aspect of the present invention, there is provided a pressure sensor which is attached to a passage member (900) through which a medium to be measured flows, and detects a pressure in the passage member. A possible mounting part (2), a protruding part (3) disposed on the mounting part and protruding from the inner wall of the passage member to the inside of the passage member, and a protruding part (3) disposed on the protruding part and inside the passage member. And a pressure detecting element (5) for detecting pressure.

According to the present invention, the pressure sensor can be attached to the passage member so as to protrude into the passage member, and the portion of the sensor located outside the passage member can be minimized. In addition, space saving in mounting the sensor can be achieved. Further, since the pressure detecting element can be disposed inside the passage member by providing the pressure detecting element in the protruding portion, the detection accuracy is improved as compared with the conventional one through the pressure introducing port.

According to the second aspect of the present invention, a mounting portion (2) that can be mounted on the passage member (900), and protrudes from the inner wall of the passage member to the inside of the passage member. A protruding portion (3), a pressure detecting element (5) disposed on the protruding portion and located in the passage member, for detecting pressure, and a portion where the pressure detecting element is disposed on the protruding portion. And a discharge passage (6, 60) for discharging water existing in the passage member into the passage member.

According to the present invention, the provision of the projection and the provision of the pressure detecting element on the projection provide an effect of saving space in mounting the sensor and improving detection accuracy. In addition, since the discharge passage for discharging the water present at the portion where the pressure detecting element is provided is provided, dirt and water in the passage member are less likely to accumulate in the pressure detecting element and its vicinity. Therefore, according to the present invention, it is possible to provide a pressure sensor that achieves the first object and has a high degree of freedom in the mounting direction regardless of the vertical direction of the passage member.

Further, if the pressure detecting element (5) is covered with a protective member (10) made of resin, the pressure detecting element can be protected from dirt and moisture. Can be realized at a higher level.

Further, according to the invention described in claim 4, according to claim 2,
In the pressure sensor of (1), the protruding portion (3) is protruded in the direction substantially
a) a concave portion (4) recessed from the distal end surface is formed, and the pressure detecting element (5) is housed in the concave portion so as to be retracted from the distal end surface of the projecting portion, and the discharge passage is formed in the concave portion. It is characterized in that it is constituted by a through hole (6) formed in the side wall of the recess so as to communicate inside and outside of the recess.

Accordingly, the pressure detecting element is housed in the recess and is not directly exposed to the flow of the medium to be measured, so that dirt and water hardly adhere. Even if dirt and water enter the recess, the dirt and water are discharged out of the recess together with water from a through hole formed as a discharge passage formed in the side wall of the recess. Hardly accumulates at the location where it is installed.

Here, in the pressure sensor of the fourth aspect, the through hole (6) is recessed in the projection direction of the projection (3) more than the pressure detection element (5). It is preferable to be located near the bottom of (4),
This makes it difficult for dirt and water entering the recess to accumulate to the height of the pressure detecting element.

Further, according to the present invention, the lead member (7) and the pressure detecting element (5) disposed on the projection (3) are connected to each other in the recess (4). When electrically connected by a wire (8) formed so as to protrude in the protruding direction of the protruding portion, the top of the wire in the protruding direction of the protruding portion is set to a position retracted from the tip end surface of the protruding portion. It is preferable that dirt and water hardly adhere to the wire. For this reason, inconveniences such as wire breakage can be more reliably prevented.

Further, the protection member (10) made of resin covers the pressure detecting element (5) in the recess (4) and does not block the through hole (6). )
If the protection member covers the connection between the wire (8) and the lead member (7) and the pressure detection element (5), the pressure detection element and the electric connection part are protected from dirt and moisture. Can be realized at a higher level.

According to the ninth aspect of the present invention, in the second aspect,
Alternatively, in the pressure sensor according to claim 3, a recess (40) is formed in a portion of the protrusion (3) facing downstream in the flow direction of the medium to be measured, and the pressure detecting element (5) is formed in the recess.
It is characterized by storing it. Accordingly, since the pressure detecting element does not face the upstream side of the fluid to be measured, the pressure detecting element is not directly exposed to the flow of the fluid to be measured, and dirt and water hardly adhere to the pressure detecting element.

Here, in the pressure sensor according to the ninth aspect, as in the tenth aspect, the projecting portion (3) is
A cover member (31) for covering the recess (40) is provided, and a discharge passage is formed in a through hole (6) formed in the cover member.
0).

[0021] In the eleventh aspect of the present invention, the first to the first aspects are provided.
11. The pressure sensor according to claim 10, wherein the protrusion (3) is provided with a temperature detecting element (20) for detecting the temperature in the passage member (900), and is originally installed in the passage member. The temperature detecting element to be arranged can be easily arranged by using the projection. Here, if the temperature detecting element is integrated on one chip together with the pressure detecting element (5), a more accurate and miniaturized sensor can be realized.

According to a thirteenth aspect of the present invention, in the pressure sensor according to the second aspect, the discharge passage (6) is formed at a position different from the direction in which the medium to be measured flows, thereby forming the medium to be measured. Is not directly applied to the pressure detecting element (5), which is preferable. Here, if the discharge passage (6) is provided on the downstream side with respect to the direction in which the medium to be measured flows as in the invention of claim 14, the effect of the invention of claim 13 is realized more effectively. it can.

According to a fifteenth aspect of the present invention, there is provided a throttle body including a pressure sensor (400) for detecting a pressure in a throttle pipe (950) through which intake air of an engine flows, wherein the pressure sensor is provided in the throttle pipe. A projection (30) projecting from the inner wall into the inside of the throttle pipe, a recess (40) formed at a portion of the projection facing the downstream side of the flow of intake air, and a recess (40) provided in the recess; And a pressure detecting element (5) for detecting pressure located in the throttle pipe.

According to the present invention, it is possible to save space in mounting the sensor, and since the pressure detecting element does not face the upstream side of the intake air, the degree of freedom of the mounting direction is independent of the vertical direction of the throttle tube. And a throttle body provided with a high pressure sensor.

In this throttle body, a protective member (1) made of resin is provided in the recess (40) so as to cover the pressure detecting element (5).
0) is preferably filled. The effect of the protection member is the same as that of the third aspect.

According to a seventeenth aspect of the present invention, there is provided a throttle body including a pressure sensor (400) for detecting a pressure in a throttle pipe (950) through which intake air of an engine flows, wherein the pressure sensor is an inner wall of the throttle pipe. (30) protruding into the throttle pipe from the cylinder, a recess (40) formed in the protrusion, and a pressure detecting element (5) disposed in the recess and located in the throttle pipe. ), And the opening of the concave portion is substantially parallel to the vertical direction.

According to the present invention, since the pressure detecting element (5) is provided on the protruding portion (30), space can be saved, and the concave portion (40) in which the pressure detecting element is provided.
Are substantially parallel to the top and bottom directions (see FIGS. 4 and 5), so that even if dirt adheres to the concave portion, it is possible to achieve a configuration in which dirt hardly accumulates or hardly adheres, and dirt accumulates. The fixation is preferable because the influence on the pressure detecting element can be reduced.

Here, the pressure detecting element (5) is disposed on the bottom surface of the concave portion (40), and the pressure receiving surface is also substantially parallel to the vertical direction. By doing so, the adhesion or fixation of dirt on the pressure receiving surface can be suppressed, which is preferable.

According to a nineteenth aspect of the present invention, there is provided a throttle body including a pressure sensor (400) for detecting a pressure in a throttle pipe (950) through which intake air of an engine flows, wherein the pressure sensor is an inner wall of the throttle pipe. (30) that protrudes from the throttle pipe into the inside of the throttle pipe, and a pressure detecting element (5) that is disposed on the protruding section and is located in the throttle pipe, and the pressure receiving surface of the pressure detecting element is upside down. It is characterized by being substantially parallel to the direction.

According to the present invention, since the pressure detecting element (5) is provided on the protruding portion (30), space can be saved, and the pressure receiving surface of the pressure detecting element is substantially parallel to the vertical direction. (See FIG. 4 and FIG. 5), so that even if dirt adheres to the pressure receiving surface, it is possible to achieve a configuration in which the dirt is hardly accumulated or hardly adhered. Can be reduced,
preferable.

According to a twentieth aspect of the present invention, in the pressure sensor according to the first aspect, the pressure receiving surface of the pressure detecting element (5) is substantially parallel to the vertical direction. Even if the dirt adheres to the pressure receiving surface, the dirt is removed by gravity or the like, so that the dirt is hardly fixed on the pressure receiving surface, and the influence of the dirt on the pressure detecting element as the pressure sensor is preferably suppressed.

Further, according to the invention of claim 21, claim 2
0, the pressure detecting element (5) is
It is arranged at the bottom of the recess (4) formed in the projection (3),
A protection member (10) is provided on the pressure receiving surface of the pressure detecting element. According to this, the pressure detecting element can be protected by the protection member against dirt, which is preferable.

Further, according to the invention of claim 22, in claim 2,
2. The pressure sensor according to claim 1, wherein the protection member (10) substantially fills the recess (4). According to this, since the protection member almost fills the recess, there is no space for collecting dirt, which is more preferable as a pressure sensor.

Further, according to the present invention, there is provided a throttle body including a pressure sensor (400) for detecting a pressure in a throttle pipe (950) through which the intake air of the engine flows, wherein the pressure sensor is provided from an inner wall of the throttle pipe. A projection (30) projecting into the throttle pipe, and a pressure detecting element (5) for pressure detection disposed in the projection and located in the throttle pipe are provided. Is characterized by pointing downwards.

According to the present invention, since the pressure detecting element (5) is provided on the protruding portion (30), space can be saved, and the pressure receiving surface of the pressure detecting element (5) is positioned in the vertical direction. Since it faces downward (see FIG. 6), dirt hardly adheres to the pressure receiving surface, which is preferable.

According to a twenty-fourth aspect of the present invention, in the throttle body according to the twenty-third aspect, the pressure detecting element (5) is provided.
Is disposed at the bottom of the recess formed in the projection (30),
The protection member (10) is provided on the pressure receiving surface of the pressure detection element, and the protection member can provide a high protection effect on the pressure receiving surface.

According to a twenty-fifth aspect of the present invention, in the pressure sensor according to the first aspect, the pressure receiving surface of the pressure detecting element (5) faces downward with respect to the vertical direction. Since the pressure receiving surface of the pressure detecting element (5) faces downward with respect to the vertical direction (see FIG. 6), it is preferable that dirt hardly adheres to the pressure receiving surface.

The reference numerals in parentheses of the above means are examples showing the correspondence with specific means described in the embodiments described later.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment)
The pressure sensor of the present invention will be described as embodied as an intake pressure sensor or an exhaust pressure sensor attached to a passage member constituting an intake system or an exhaust system of an engine. FIG. 1 shows a schematic cross-sectional configuration of a pressure sensor 100 according to the present embodiment. The pressure sensor 100 is attached to a pipe wall of a passage member (intake manifold, surge tank, throttle body, etc.) 900 through which air (medium to be measured) flows, and detects the pressure in the passage member 900. I have. This passage member 900 is made of, for example, iron or aluminum.

1 is a main body of the pressure sensor 100,
The main body 1 is made of PPS (polyphenylene sulfide)
And a resin material such as PBT (polybutylene terephthalate). The main body 1 includes a passage member 90.
Mounting portion 2 that can be mounted on the outer wall surface of
And a protruding portion 3 protruding from the inner wall surface of the passage member 900 to the inside of the passage member 900.

The mounting portion 2 has a flange shape (collar shape), and has a threaded screw hole 2a. Then, the mounting portion 2 is fixed to the passage member 900 by screws 2b made of metal or resin through the screw holes 2a. Further, in this example, the protruding portion 3 has a substantially cylindrical shape, is inserted in the axial direction of the cylinder into a hole 901 formed in the tube wall of the passage member 900, and substantially coincides with the direction of air flow inside the passage member 900. It protrudes in the direction perpendicular to the direction. Here, the height (projection height) from the inner wall surface of the passage member 900 to the distal end surface 3a of the projection 3 is:
For example, it is 10 mm to 20 mm.

An O-ring 3b is interposed between the protruding portion 3 and the hole 901 for sealing. Although not shown, the O-ring groove for accommodating the O-ring 3b may be provided on the protruding portion 3 side or on the inner peripheral surface side of the hole 901.
Also, it may be on both of these sides.

A concave portion 4 is formed on the distal end surface 3a of the projecting portion 3 so as to be recessed from the distal end surface 3a. The distal end portion of the projecting portion 3 has a cylindrical shape due to the concave portion 4. This recess 4
Can be, for example, a cylindrical hole having a depth of 5 mm or less. A pressure detecting element 5 for pressure detection is provided in the recess 4 by being adhered to the bottom of the recess 4 via a glass pedestal or the like, and is located in the passage member 900.

Although not shown, the pressure detecting element 5 is formed, for example, by forming a plurality of diffusion resistors on a diaphragm made of a semiconductor material (for example, single crystal silicon) having a piezoresistive effect, and bridging these diffusion resistors. The configuration is such that the change in the resistance value of the diffusion resistor according to the deformation of the diaphragm is extracted as an electric signal from the bridge circuit.

Further, a through hole (a discharge passage in the present invention) 6 is formed in the side wall of the concave portion 4 of the projecting portion 3 so as to communicate inside and outside of the concave portion 4. The through hole 6 is configured as a discharge passage for discharging the water present in the portion where the pressure detecting element 5 is provided, that is, the concave portion 4, into the passage member 900. The shape of the through hole 6 is not particularly limited, and may be a round hole or a square hole.

Opening of recess 4 (tip surface 3a of projection 3)
When the pressure sensor 100 is mounted so that the pressure sensor 100 is directed upward (including obliquely upward) or horizontally, water that is to stay in the recess 4 mainly flows out of the recess 4 from the through hole 6 by its own weight. It has become. In this example,
The pressure sensor 100 is attached to the lower side of the passage member 900. In such a case, in order to prevent water from accumulating to the height of the pressure detecting element 5, the through hole 6 is Recess 4 than pressure sensing element 5 in the direction
Is preferably located closer to the bottom surface.

Further, a lead member 7 for taking out the signal of the pressure detecting element 5 to the outside is insert-molded in the main body 1. The lead members 7 are made of, for example, a conductive member such as phosphor bronze. In this example, three lead members 7 are provided for output to the pressure detecting element 5, for power supply, and for GND. One end of each lead member 7 has a recess 4
And is electrically connected to the pressure detecting element 5 by a wire 8 formed by wire bonding or the like, and the other end is exposed to a connector section 9 formed in the mounting section 2. The connector portion 9 has such a shape that the exposed portion of the lead member 9 can be connected to an external terminal.

Here, in this embodiment, the pressure detecting element 5 located in the passage member 900 is housed in the recess 4 at a position retracted from the tip end surface 3a of the protruding portion 3. The wire 8 is formed so as to protrude in the protruding direction of the protruding portion 3 in the recess 4, and the top of the wire 3 in the protruding direction of the protruding portion 3 is higher than the distal end surface 3 a of the protruding portion 3. It is in the retracted position.

The recess 4 is filled with a protective member 10 made of resin or the like so as to cover the pressure detecting element 5 and not block the through hole 6. Further, the protective member 10
Covers the connection between the pressure detecting element 5 and the wire 8 and the connection between the lead member 7 and the wire 8. As the protective member 10, for example, a fluorine-based gel or a silicon-based gel modified with fluorine can be used.

In the pressure sensor 100, the main body 1 in which the lead member 7 is buried is formed by resin molding, the pressure detecting element 5 is disposed in the concave portion 4, and the connection of the wire 8 is performed by wire bonding or the like. After performing, the protective member 10 can be filled to perform manufacturing. Then, the manufactured pressure sensor 100 inserts the protruding portion 3 into the hole 901 of the passage member 900 via the O-ring 3b, and fixes the mounting portion 2 to the passage member 900 with the screw 2b, as shown in FIG. And so on.

The pressure (intake pressure) in the passage member 900 is applied to the pressure detecting element 5, and the pressure detecting element 5 outputs an electric signal based on the applied pressure. This electric signal is extracted to the outside via the wire 8 and the lead member 7. Thus, the pressure (intake pressure) in the passage member 900 is detected. The detected intake pressure is stored in an external circuit (not shown) (e.g., a vehicle ECU).
Is used for an engine control signal and the like.

By the way, according to the present embodiment, the protrusion 3
The pressure detecting element 5 can be disposed inside the passage member 900 by providing the pressure detecting element 5 in the path member 900. For this reason, a pressure closer to the actual pressure (intake pressure) is applied to the pressure detection element 5 than the conventional one through the pressure introduction port, and the detection accuracy is improved. Also, the location of the pressure detecting element 5 (the concave portion 4)
Is provided, the dirt and moisture in the passage member 900 are less likely to accumulate in the pressure detecting element 5 and its vicinity.

More specifically, a concave portion 4 is formed in the distal end surface 3a of the projecting portion 3 projecting in a direction substantially perpendicular to the flow direction of the air (measurement medium), and the pressure detecting element 5 is connected to the distal end surface of the projecting portion 3. 3
It is housed in the recess 4 so as to be at a position retracted from the position a. Therefore, the pressure detection element 5 is not directly exposed to the flow of air, and dirt and water are less likely to adhere.
Even if dirt and water enter the recess 4, the dirt and water are discharged out of the recess 4 together with the water through a through hole (discharge passage) 6 formed in the side wall of the recess 4. It hardly accumulates in the inside, that is, at the position where the pressure detecting element 5 is disposed.

In particular, in the example shown in FIG.
Is located closer to the bottom surface of the concave portion 4 than the pressure detecting element 5 in the protruding direction of the protruding portion 3, so that dirt and water entering the concave portion 4 can hardly be accumulated up to the height of the pressure detecting element 5. . Note that, contrary to the example shown in FIG. 1, when the pressure sensor 100 is attached to the upper portion of the passage member 900, it is apparent that dirt and water hardly accumulate in the recess 4.

Further, since the through hole 6 is provided on the downstream side with respect to the flow of air, the pressure detecting element 5 is preferably not directly caused to flow through the air through the through hole 6. The position of the through hole 6 with respect to the flow of air is not limited to the downstream side of the flow of air, and may be different from the direction in which the air flows. However, preferably, the upstream side of the air flow should be avoided.

In the example shown in FIG. 1, the top of the wire 8 in the protruding direction of the protruding portion 3 in the recess 4 is located at a position retracted from the distal end surface 3 a of the protruding portion 3.
For this reason, dirt and water hardly adhere to the wire 8, and problems such as disconnection of the wire 8 can be more reliably prevented. Furthermore, in this example, since the connection between the pressure detecting element 5, the wire 8 and the lead member 7 and the pressure detecting element 5 is covered by the protection member 10, the pressure detecting element 5 and the electric connection part are protected from dirt and moisture. Can be protected at a higher level.

As described above, according to the present embodiment, even if the pressure sensor 100 is attached to a portion other than the upper portion of the passage member 900, the dirt and water entering the recess 4 are prevented from passing through the recess 6 through the recess 6. 4, the pressure detecting element 5
In addition, dirt and water hardly adhere to the wire 8, and problems such as fluctuations in sensor characteristics due to dirt and icing and disconnection of the electrical connection part can be avoided. Therefore, according to the present embodiment, it is possible to provide the pressure sensor 100 having a high degree of freedom in the mounting direction regardless of the vertical direction of the passage member 900.

According to the present embodiment, the connector 9 of the mounting portion 2 is substantially located only outside the passage member 900. Therefore, as compared with the conventional configuration in which the pressure introduction port is inserted into the passage member and the sensor main body portion is located outside the passage member (see FIG. 8), the portion located outside the passage member is reduced, Since the projection area (the area required for mounting) is reduced, the mounting space is small and the mounting performance is improved.

In the pressure sensor 100 of the present embodiment, the through hole (discharge passage) 6 may not be provided. Even in that case, as a result, the mounting space can be reduced, so that the space for mounting the sensor can be saved. However, as described above, it is better to form the through hole 6 in order to increase the degree of freedom in the mounting direction regardless of the vertical direction.

(Second Embodiment) In the present embodiment, the first
In the embodiment, the formation position of the concave portion and the formation position of the through hole in the protrusion 3 are different. Hereinafter, differences from the first embodiment will be mainly described. FIG.
1 is an overall configuration diagram of a pressure sensor 200 according to the present embodiment, and a part is shown in a schematic cross section. Note that FIG.
The same parts as those in the first embodiment are denoted by the same reference numerals as those in FIG.

The protruding portion 3 of the sensor 200 comprises a columnar protruding base 30 and a lid (cover member in the present invention) 31 fixed to the protruding base 30. At a portion of the protruding base 30 facing the downstream side in the flow direction of the air (measurement medium), a concave portion 40 recessed from the surface is formed,
The pressure detecting element 5 is housed in the recess 40 by bonding or the like via a glass pedestal or the like. The size and shape of the concave portion 40 are not limited, but may be the same as, for example, the first embodiment.

Further, the pressure detecting element 5 and the wire 8 are located almost completely in the recess 40 and are covered with the protective member 10. In this example, the protection member 10 is not partially filled as shown in FIG. 1 but is filled so as to fill the entire concave portion 4, but may be partially filled. Although not shown in FIG. 2, a lead member is embedded in the protruding base 30 as in the first embodiment, and the lead member is electrically connected to the wire 8 and connected to the connector 9. Can be connected to external terminals.

The lid 31 is provided so as to cover the recess 40 of the protruding base 30, and is adhered and fixed to the protruding base 30 with an adhesive 32. In this lid part 31,
One or more (five in FIG. 2) through-holes 60 are formed to communicate between the inside and outside of the lid 31. The through-holes 60 correspond to a discharge passage of the present invention. As shown in FIG.
The through-holes 60 are formed at various parts of the lid 31 so that water in the lid 31 is discharged regardless of the direction in which the pressure sensor 200 is mounted. In addition, since communication between the inside and outside of the lid 31 is enabled only by the through hole 60, dirt and water are less likely to enter the inside of the lid 31.

As described above, even in the present embodiment, even if the pressure sensor 200 is attached to a portion other than the upper portion of the passage member 900, the dirt and water in the concave portion 40 are discharged through the through-hole 60. Problems such as fluctuations in sensor characteristics due to icing or icing, and disconnection of the electrical connection portion are avoided. Therefore, it is possible to provide the pressure sensor 200 having a high degree of freedom in the mounting direction regardless of the vertical direction of the passage member 900.

Further, according to the present embodiment, since the pressure detecting element 5 does not face the upstream side of the air (fluid to be measured),
It is not directly exposed to the flow of air, so that dirt and water hardly adhere to the pressure detecting element 5. Also, the effect of improving the mountability is provided similarly to the first embodiment.

(Third Embodiment) In the present embodiment, the second embodiment
The temperature sensor is added to the pressure sensor of the embodiment. FIG. 3 is an overall configuration diagram of the pressure sensor 300 according to the present embodiment, a part of which is shown in a schematic cross section. In FIG. 3, the same parts as in the second embodiment are denoted by the same reference numerals as in FIG.

A temperature detecting element 20 for detecting the temperature inside the passage member 900 is provided on the lid 31 of the protruding portion 3. The temperature detecting element 20 includes, for example, an element portion 21 made of a general thermistor material and
And a lead wire 22 for taking out an output (signal) from the device 1. The element portion 21 is supported by the lid portion 31 via the lead wire 22 and is arranged so as to be exposed to the flow of air in the passage member 900.

Although not shown, the lead wire 22 is
Cover part 31 by insert molding so as not to overlap with zero.
Buried inside. Although not shown, lead wire 2
2 is located on the side opposite to the element portion 21.
Is electrically connected to a lead member provided therein.
This lead member is for a temperature detecting element separate from the lead member 7 shown in FIG. 1 described above, but can be connected to an external terminal at the connector section 9, so that the temperature detecting element The output 20 can be taken out.

Even if the load on the engine is the same, the intake pressure changes depending on the intake air temperature. In the present pressure sensor 300, the temperature of the intake pressure detected by the pressure detecting element 5 can be corrected based on the output of the temperature detecting element 20. That is, the intake pressure is corrected at the same temperature as the location where the intake pressure is detected, and more accurate intake pressure can be detected.

As described above, according to the present embodiment, in addition to providing the same effects as those of the second embodiment, the temperature detecting element 20 for detecting the temperature inside the passage member 900 is provided at the projecting portion 3. This is characterized in that the temperature detecting element 20 to be originally installed in the passage member 900 can be easily arranged by using the protrusion 3.

The addition of the temperature detecting element to the pressure sensor is similar to that of the pressure sensors 100 and 2 shown in the above embodiment.
At 00, the temperature detecting element may be integrated with the pressure detecting element 5 on a single chip using a known semiconductor manufacturing technique. Thereby, a more accurate and miniaturized sensor can be realized.

For example, a thin film resistor having a temperature-resistance characteristic is formed on a semiconductor chip constituting the pressure detecting element 5 by vapor deposition or the like, and this is used as a temperature detecting element, and a wiring pattern for this temperature detecting element is formed. Form. As the thin film resistor as the temperature detecting element, for example, a platinum vapor deposition film or the like can be adopted.

(Fourth Embodiment) A fourth embodiment of the present invention is directed to a pressure sensor capable of saving space in mounting the pressure sensor and increasing the degree of freedom in mounting direction regardless of the vertical direction. It is intended to provide a throttle body provided. In the drawings of the present embodiment, the same portions as those in the above embodiment are denoted by the same reference numerals. FIG. 4 is a diagram showing a schematic sectional configuration of a main part of the throttle body according to the present embodiment.

The throttle body constitutes a part of the intake system of the engine of the automobile and controls the amount of intake air of the engine. FIG. 4 shows a schematic cross section of the throttle body 950 in the direction of intake air flow in the throttle body.

Inside the throttle pipe 950, there is provided a throttle valve 951 for controlling the amount of intake air from the upstream air cleaner side to flow to the downstream engine side. In the throttle pipe 950, the throttle valve 951
A pressure sensor 400 is provided between the engine and the engine.

The main body 1 of the pressure sensor 400 can have the same configuration as that of the pressure sensor of the second embodiment, and is mounted on the wall of the throttle pipe 950 at the mounting portion 2. The pressure sensor 400 of the second embodiment has no lid in the pressure sensor of the second embodiment. At this time, the projection base 30 corresponds to the projection of the throttle body of the invention.

The pressure sensor 400 includes a protruding base 30 protruding from the inner wall of the throttle pipe 950 to the inside of the throttle pipe 950, and a recess 40 formed at a portion of the protruding base 30 facing the downstream side of the flow of intake air. And a pressure detecting element 5 disposed in the recess 40 and located in the throttle pipe 950. In FIG. 4, a lead member, a wire, and an O-ring are omitted.

As described above, according to the present embodiment, the pressure sensor 400 can be attached to the throttle pipe 950 so as to protrude into the throttle pipe 950, and the portion of the sensor located outside the throttle pipe 950 can be removed. Since it can be minimized, space saving in mounting the sensor can be achieved.

Conventionally, since various mounting methods are used for the throttle body depending on the type of the vehicle, it is necessary to design the mounting position of the pressure sensor and the pressure introduction passage in accordance with the mounting direction of the throttle body. That point,
According to the present embodiment, the pressure introduction passage is unnecessary, and the pressure detection element 5 does not face the intake upstream side.
Not directly exposed to inspiratory flow.

Further, since the pressure sensor itself is provided vertically, even if dirt adheres, the dirt is removed by its own weight. Therefore, dirt does not adhere to the negative pressure surface side (the side where the protection member 10 is exposed) of the pressure detection element 5, and the influence on the sensor characteristics can be suppressed. Note that the sensor is vertical when the pressure receiving surface of the pressure sensor is substantially parallel to the vertical direction, and even if dirt adheres to the protection member 10 on the pressure receiving surface, the sensor is removed by its own weight. This means, for example, within 45 °, preferably within 25 °, and optimally within 10 ° with respect to the vertical direction.

Therefore, even if the intake gas contains a pollutant gas such as an EGR gas or a blow-by gas, dirt K and water hardly adhere to the pressure detecting element 5. Therefore, according to the present embodiment, it is possible to provide a throttle body including the pressure sensor 400 having a high degree of freedom in the mounting direction, regardless of the vertical direction of the throttle pipe 950, and to provide a throttle body corresponding to various types of vehicles. Can be easily provided.

In this throttle body,
The protection member 10 is filled in the recess 40 and the pressure detection element 5 is covered with the protection member 10.
The protection of the pressure detection element 5 from moisture and moisture can be realized at a higher level, which is preferable. Note that the protection member 10 may not be filled. Also, in the present embodiment, similarly to the second embodiment, a configuration may be employed in which a cover (not shown) is provided on the pressure sensor 400 and a through-hole is provided in the cover.

Here, FIGS. 5 and 6 show modified examples of the throttle body of the present embodiment. In FIG. 4 above,
The pressure sensor 400 is connected to the throttle pipe 9 extending in the horizontal direction.
In the first modified example shown in FIG. 5, the pressure sensor 400 is mounted on the ground side of the throttle pipe 950 extending in the horizontal direction. Also, as in the second modified example shown in FIG. 6, it can be attached to the throttle pipe 950 extending in the vertical direction. In this case, since the pressure receiving surface side of the pressure detecting element 5 is the lower surface, dirt is removed. Difficult to deposit. The effects of the present embodiment are the same even in these modified examples.

(Other Embodiments) In the above embodiment, the projecting portion 3 does not have to be substantially perpendicular to the air flow, and may be inclined from a perpendicular direction. For example,
In the case of the first embodiment, it is preferable that the protruding portion 3 is inclined to the opposite side (the right side in FIG. 1) to the air flow, because the air hardly hits the pressure detecting element 5 directly.

In the first embodiment, the recess 4
The through hole formed at the bottom of the recess 4 may be formed in addition to the side wall of the recess 4. In this case, the through-hole may be formed so as to communicate from the bottom of the concave portion 4 to the outer surface of the protruding portion 3 while taking care not to block the through-hole with the protection member 10.

In recent years, in an engine intake system of an automobile, an EGR is often provided to recirculate a part of exhaust gas into the intake system. In the embodiment, the detecting element 5
It is becoming an important issue to prevent dirt and water from adhering to the wire (the portion where the wire 8 is disposed). In view of such circumstances, the above embodiment is effective. However, the present invention is also applicable to an exhaust pressure sensor or the like which is attached to an exhaust system of an engine (eg, an exhaust pipe of the engine) and detects an engine exhaust pressure. good.

In short, the present invention can be applied to any pressure sensor that is attached to a passage member through which a medium to be measured flows and detects the pressure in the passage member. It is. Further, since the semiconductor type pressure sensor is sensitive to the adhesion of dirt and water, the application of the present invention is particularly effective. However, a piezoelectric element may be used as the pressure detecting element.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a pressure sensor according to a first embodiment of the present invention.

FIG. 2 is an overall configuration diagram of a pressure sensor according to a second embodiment of the present invention.

FIG. 3 is an overall configuration diagram of a pressure sensor according to a third embodiment of the present invention.

FIG. 4 is a schematic sectional view showing a main part of a throttle body according to a fourth embodiment of the present invention.

FIG. 5 is a schematic sectional view showing a first modification of the fourth embodiment.

FIG. 6 is a schematic sectional view showing a second modification of the fourth embodiment.

FIG. 7 is a schematic sectional view showing a conventional pressure sensor.

FIG. 8 is an explanatory diagram for explaining adhesion of dirt and water depending on a mounting position in a conventional pressure sensor.

[Explanation of symbols]

2 mounting part, 3 projecting part, 4, 40 recess, 5 pressure detecting element, 6, 60 through hole, 7 lead member, 8 wire, 10 protection member, 20 temperature detecting element, 900 ... passage member.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor ▲ Toku ▼ Minoru 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside DENSO Corporation (72) Inventor Haruhisa Koichi 1-1-1, Showa-cho, Kariya-shi, Aichi Stock Inside the company DENSO (72) Inventor Akira Shimazu 1-1-1, Showa-cho, Kariya-shi, Aichi F-term in the company DENSO (reference) 2F055 AA22 BB20 CC02 DD05 EE14 FF38 FF43 GG12 GG25 HH05 3G065 CA00 GA01 GA06 HA21 HA22

Claims (25)

[Claims] 1. A pressure sensor which is attached to a passage member (900) through which a medium to be measured flows and detects a pressure in the passage member, the attachment portion being attachable to the passage member. A protruding portion (3) disposed on the mounting portion and protruding from the inner wall of the passage member to the inside of the passage member; and a pressure for pressure detection disposed on the protruding portion and located in the passage member. A pressure sensor, comprising: a detection element (5). 2. A pressure sensor which is attached to a passage member (900) through which a medium to be measured flows and detects a pressure in the passage member, the attachment portion being attachable to the passage member. A protruding portion (3) disposed on the mounting portion and protruding from the inner wall of the passage member to the inside of the passage member; and a pressure for pressure detection disposed on the protruding portion and located in the passage member. A detection element (5); and a discharge passage (6, 60) disposed on the projecting portion, for discharging water present at a position where the pressure detection element is disposed, into the passage member. Features pressure sensor. 3. The pressure sensor according to claim 2, wherein the pressure detecting element is covered with a protective member made of resin. 4. The protruding portion (3) protrudes in a direction substantially perpendicular to the flow direction of the medium to be measured, and has a tip surface (3a).
A concave portion (4) recessed from the distal end surface is formed, the pressure detecting element (5) is housed in the concave portion at a position retracted from the distal end surface of the protruding portion, and the discharge is performed. The pressure sensor according to claim 2, wherein the passage is a through hole (6) formed in a side wall of the concave portion so as to communicate inside and outside the concave portion. 5. The protrusion (3), wherein the through-hole (6) is provided with the protrusion (3).
The pressure sensor according to claim 4, wherein the pressure sensor is located closer to the bottom surface of the recess (4) than the pressure detection element (5) in the projecting direction. 6. The projection (3) is provided with a lead member (7) for extracting a signal of the pressure detection element (5) to the outside, and the lead member, the pressure detection element, Are electrically connected to each other by a wire (8) formed so as to protrude in the protruding direction of the protruding portion in the recess (4), and the top of the wire in the protruding direction of the protruding portion is The pressure sensor according to claim 4, wherein the pressure sensor is located at a position retracted from a tip end surface of the protrusion. 7. A protection member (10) made of resin is filled in the recess (4) so as to cover the pressure detection element (5) and not to block the through hole (6). The pressure sensor according to claim 6, wherein a connection between the wire (8), the lead member (7), and the pressure detecting element (5) is covered with the protection member. 8. The lead member (7) is connectable to the outside via a connector part (9) formed on the mounting part (2).
Pressure sensor. 9. A recess (40) in a portion of the protruding portion (3) facing downstream in the flow direction of the medium to be measured.
And the pressure detecting element (5) is housed in the recess.
Pressure sensor. 10. The projection (3) is provided with the recess (4).
Pressure sensor according to claim 9, characterized in that it has a cover member (31) covering 0) and the discharge passage is a through hole (60) formed in the cover member. 11. A temperature detecting element (2) for detecting a temperature in the passage member (900) is provided at the projecting portion (3).
The pressure sensor according to claim 1, wherein 0) is provided. 12. The pressure sensor according to claim 11, wherein said temperature detecting element is integrated with said pressure detecting element on a single chip. 13. The pressure sensor according to claim 2, wherein the discharge passage (6) is formed at a position different from a direction in which the medium to be measured flows. 14. The pressure sensor according to claim 13, wherein the discharge passage is provided on a downstream side with respect to a direction in which the measured medium flows. 15. A throttle body provided with a pressure sensor (400) for detecting a pressure in a throttle pipe (950) through which intake air of an engine flows, wherein the pressure sensor is disposed inside the throttle pipe from an inner wall of the throttle pipe. A recess (40) formed at a portion of the protrusion facing the downstream side of the flow of intake air; and a pressure detector disposed in the recess and located in the throttle pipe. And a pressure detecting element (5) for use in the throttle body. 16. The protection member (10) made of resin is filled in the recess (40) so as to cover the pressure sensing element (5).
Throttle body described in. 17. A throttle body provided with a pressure sensor (400) for detecting a pressure in a throttle pipe (950) through which intake air of an engine flows, wherein the pressure sensor is disposed inside the throttle pipe from an inner wall of the throttle pipe. A protruding portion (30) protruding into the protruding portion, a concave portion (40) formed in the protruding portion, and a pressure detecting element (5) disposed in the concave portion and located in the throttle pipe for pressure detection. A throttle body, wherein an opening of the recess is substantially parallel to a vertical direction. 18. The pressure detecting element (5) is disposed on a bottom surface of the recess (40), and a pressure receiving surface thereof is substantially parallel to the vertical direction.
7. The throttle body according to 7. 19. A throttle body provided with a pressure sensor (400) for detecting a pressure in a throttle pipe (950) through which intake air of an engine flows, wherein the pressure sensor is disposed inside the throttle pipe from an inner wall of the throttle pipe. And a pressure detecting element (5) disposed on the projecting portion and located in the throttle pipe, for detecting pressure, wherein a pressure receiving surface of the pressure detecting element is vertically oriented with respect to the vertical direction. A throttle body characterized by being substantially parallel. 20. A pressure receiving surface of the pressure detecting element (5),
The pressure sensor according to claim 1, wherein the pressure sensor is substantially parallel to a vertical direction. 21. The pressure detecting element (5) is disposed at a bottom of a concave portion (4) formed in the projecting portion (3), and a protection member (10) is provided on a pressure receiving surface of the pressure detecting element. The pressure sensor according to claim 20, wherein a pressure sensor is provided. 22. The pressure sensor according to claim 21, wherein the protection member (10) substantially fills the recess (4). 23. A throttle body provided with a pressure sensor (400) for detecting a pressure in a throttle pipe (950) through which intake air of an engine flows, wherein the pressure sensor is disposed inside the throttle pipe from an inner wall of the throttle pipe. And a pressure detecting element (5) disposed on the projecting portion and located in the throttle pipe, for detecting pressure, wherein a pressure receiving surface of the pressure detecting element is vertically oriented with respect to the vertical direction. The throttle body is characterized by pointing downwards. 24. The pressure detecting element (5) is provided at a bottom of a concave portion formed in the projecting portion (30), and a protection member (10) is provided on a pressure receiving surface of the pressure detecting element. The throttle body according to claim 23, wherein the throttle body is provided. 25. The pressure sensor according to claim 1, wherein a pressure receiving surface of the pressure detecting element is directed downward with respect to a vertical direction.