JP5972803B2 - In-vehicle control device - Google Patents

Description

  The present invention relates to an in-vehicle control device mounted on an automobile, and relates to a heat dissipation structure thereof.

  Conventionally, an in-vehicle control device generally has a heat dissipation structure from the viewpoint of dissipating self-heating of electronic components incorporated therein. The main heat dissipating structure is a structure that conducts heat from a heat generating component mounted on a substrate directly or through a substrate to a metal cover or case and radiates heat from the surface of the cover or case to the air. However, in recent years, in order to reduce weight, size, and cost, introduction of housings (covers and cases) made of only resin has been studied. In the case of a resin casing, since a conventional heat dissipation structure by heat conduction to a metal casing cannot be applied, it is a problem to efficiently perform heat dissipation by ventilation.

  JP-A-2004-245198 (Patent Document 1) is known as a conventional technique using a resin casing. The vehicle-mounted control device described in this publication includes an air introduction through hole provided in the upper surface of a plastic case (housing) and an air exhaust through hole provided in the lower surface of the case. Externally attached to the upper surface of the intake pipe. A portion of the intake pipe that contacts the case is provided with a through hole communicating with the air discharge through hole. Since the inside of the intake pipe is lower than the atmospheric pressure, air flows into the case through the air introduction through hole and flows into the intake pipe through the air discharge through hole and the intake pipe through hole. This air flow hits electronic parts (power transistors, microcomputers, output transistors, etc.) that generate a large amount of heat on the printed circuit board in the case, and suppresses temperature rise due to heat generation of these electronic parts (see paragraphs 0016 to 0021). ).

JP 2004-245198 A

  In the vehicle-mounted control device of Patent Document 1, external air is introduced into the case (chassis) of the vehicle-mounted control device by utilizing the negative pressure in the intake pipe of the air cleaner. For this reason, there is no consideration about using the air flow outside the vehicle-mounted control device. An air flow is generated outside the in-vehicle control device. By using this air flow, external air can be introduced into the housing of the in-vehicle control device. However, this requires attention to the direction of air flow. That is, it is desirable to increase the air introduction efficiency by allowing air flowing from various directions to be introduced into the housing. In addition, as in Patent Document 1, even when external air is introduced into the housing of the in-vehicle control device using the negative pressure in the intake pipe of the air cleaner, the air outside the in-vehicle control device is used. Utilizing the flow, the efficiency of introducing air into the housing can be increased.

  It is an object of the present invention to widen the range in which the air flow direction can be introduced into the housing, to increase the efficiency of introducing air into the housing, and to improve the heat dissipation performance from the heat generating components inside the housing. To provide an apparatus.

In order to achieve the above object, a vehicle-mounted control device of the present invention is a vehicle-mounted control device mounted on an automobile,
Comprising: a circuit board on which the electronic component is provided, and a housing accommodating the circuit board,
The housing is
A first opening for capturing an air flow flowing in a first direction;
A second opening for taking in an air flow flowing in a second direction perpendicular to the first direction;
A first barrier portion provided upstream of the first opening in the second direction and serving as a barrier against airflow flowing in the second direction;
A second barrier portion provided upstream of the second opening in the first direction and serving as a barrier against airflow flowing in the first direction;
With
A communication passage that communicates between the first opening and the second opening is provided, and a communication hole that communicates with the interior of the housing in which the circuit board is disposed is provided in the communication passage.

  ADVANTAGE OF THE INVENTION According to this invention, the range which can be introduced in the inside of a housing | casing about the direction of the flow of air can be expanded, and the introduction efficiency of the inside of a housing can be improved. Thereby, the thermal radiation performance from the heat-emitting component inside a housing | casing can be improved.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

The perspective view which shows one Example (Example 1) of the control apparatus of this invention. Sectional drawing which looked at the AA cross section of FIG. 1 from the y direction (width direction), and sectional drawing which looked at the BB cross section from the x direction (length direction). It is AA sectional drawing of FIG. 1, and is a figure explaining the air flow which flows into a x direction. It is AA sectional drawing of FIG. 1, and is a figure explaining the air flow which flows into a -x direction (reverse direction of x direction). It is AA sectional drawing of FIG. 1, and is a figure explaining the air flow which flows into az direction. It is AA sectional drawing of FIG. 1, and is a figure explaining the airflow which flows into a -z direction (reverse direction of z direction). The perspective view which shows the example which changed the position of the barrier part with respect to FIG. The perspective view which shows one Example (Example 2) of the control apparatus of this invention. AA sectional drawing of FIG. BB sectional drawing of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the x, y, and z directions are defined as shown in FIG.

  Hereinafter, Embodiment 1 of the vehicle-mounted control device according to the present invention will be described with reference to FIGS. 1 to 4.

  FIG. 1 is a perspective view showing the configuration of Embodiment 1 of the present invention. 2 is a cross-sectional view of the AA cross section of FIG. 1 as viewed from the y direction (width direction) (right side of the paper), and a cross-sectional view of the BB cross section from the x direction (length direction) (left side of the paper). It is. FIG. 3A is a cross-sectional view taken along the line AA in FIG. FIG. 3B is a cross-sectional view taken along the line AA in FIG. 1 and is a diagram for explaining the air flow flowing in the −x direction (the reverse direction of the x direction). FIG. 3C is a cross-sectional view taken along the line AA of FIG. 3D is a cross-sectional view taken along the line AA in FIG. 1 and is a diagram illustrating an air flow flowing in the −z direction (the reverse direction of the z direction). FIG. 4 is a perspective view showing an example in which the position of the barrier portion is changed with respect to FIG.

  In the in-vehicle control device 100 of the present embodiment, as shown in FIG. 2, a circuit board 16 on which electronic components 2a, 2b, and 2c are mounted is accommodated in a casing (case) 1 formed of resin. The housing 1 includes a fixed-side peripheral wall 1a located on the side fixed to the automobile, and an anti-fixed-side peripheral wall facing the fixed-side peripheral wall 1a with an internal space 17 in which the circuit board 16 and the circuit board 16 are disposed. 1b and two side peripheral wall portions 1c and 1d connecting the fixed side peripheral wall portion 1a and the anti-fixed side peripheral wall portion 1b at the circumferential end portions 1a1 and 1a2 of the fixed side peripheral wall portion 1a, and perpendicular to the circumferential direction The first end face wall 1e and the second end face wall 1f are provided at both end face portions in various directions. That is, in the present embodiment, the housing 1 has a substantially hexahedral shape. Further, the fixed side peripheral wall portion 1a and the anti-fixed side peripheral wall portion 1b are configured vertically, and the side peripheral wall portions 1c and 1d are configured vertically to the fixed side peripheral wall portion 1a and the anti-fixed side peripheral wall portion 1b. Yes. The fixed side peripheral wall portion 1a, the anti-fixed side peripheral wall portion 1b, the side peripheral wall portions 1c and 1d, the first end surface wall 1e, and the second end surface wall 1f are surfaces constituting the housing (case) 1, and are described below. In the description of FIG.

A groove 1g for attaching a circuit board is provided on the inner wall surfaces of the side peripheral wall portions 1c and 1d of the housing 1. A connector portion 18 is formed on the first end face wall 1 e, and a wire 19 drawn from the circuit board 16 forms a terminal 19 inside the connector portion 18.
In addition, the space part 17 may be filled with a filler such as a resin up to a height enough to hide the entire circuit board 16.

  The heat dissipation structure will be described with reference to FIGS. 1, 2, 3A, 3B, 3C, and 3D. In FIGS. 3A, 3B, 3C, and 3D, arrows indicate the flow of air.

  Openings 5 and 6 are provided on one surface (anti-fixed side peripheral wall portion) 1b of the resin casing 1 including the circuit board 16 and a surface (second end surface wall) 1f perpendicular thereto, respectively. A communication path 7 is provided between the opening 5 and the opening 6 so as to connect both the openings 5 and 6. The communication passage 7 is provided with a communication hole (vent hole) 8 for flowing air between the communication passage 7 and the electronic component 2a.

  A barrier portion (partition) 9 is installed on the housing surface 1 f side (upstream side in the −x direction) of the opening 5, and a barrier portion (screen) 10 is installed on the housing surface 1 b side (upstream side in the −z direction) of the opening 6. ing. The barrier portion (partition) 9 is constituted by a protruding portion protruding from the housing surface 1b so as to be a barrier against the air flow in the x direction (or -x direction). The barrier portion (partition) 10 is configured by a protruding portion protruding from the housing surface 1f so as to be a barrier against the air flow in the z direction (or -z direction). With this configuration, when air flows in the x direction along the housing surface 1b, the air hits the barrier 9 and enters the opening 5 (FIG. 3A). When air flows in the −x direction along the housing surface 1b, air enters the opening 6 and negative pressure is generated at the opening 5 (FIG. 3B). For this reason, the flow velocity of the air that enters the opening 6 and exits the opening 5 through the communication passage 7 increases.

  When air flows in the z direction along the housing surface 1f, the air hits the barrier 10 and enters the opening 6 (FIG. 3C). When air flows in the −z direction along the housing surface 1f, the air enters the opening 5 and a negative pressure is generated at the opening 6 (FIG. 3D). For this reason, the flow velocity of the air which enters the opening part 5 and passes through the communication path 7 and exits to the opening part 6 increases.

  Furthermore, a barrier portion (partition) 12 is provided on the opposite side (upstream side in the −y direction) of the opening 5 from the housing surface 1 c, and a barrier portion (partition) 13 is provided on the housing surface 1 c side (upstream side in the y direction) of the opening 6. Is installed. The barrier portion (partition) 12 is configured by a protruding portion protruding from the housing surface 1b so as to be a barrier against air flow in the y direction (or -y direction). The barrier portion (partition) 10 is configured by a protruding portion protruding from the housing surface 1f so as to be a barrier against the air flow in the z direction (or -z direction). With this configuration, when air flows in the y direction along the housing surfaces 1 b and 1 f, the air hits the barrier portion 12 and enters the opening 5, and a negative pressure is generated at the opening 6. For this reason, the flow velocity of the air which enters the opening part 5 and passes through the communication path 7 and exits to the opening part 6 increases. When air flows in the −y direction along the housing surfaces 1 b and 1 f, the air hits the barrier portion 13 and enters the opening 6, and a negative pressure is generated at the opening 5. For this reason, the flow velocity of the air that enters the opening 6 and exits the opening 5 through the communication passage 7 increases.

  The relationship between the openings 5 and 6 and the barriers 9, 10, 12, and 13 and the flow direction of the present embodiment will be described below with reference to the flow direction.

Case 1 is
A first opening 5 for taking in an air flow flowing in a first direction (-z direction);
A second opening 6 for taking in an air flow flowing in a second direction (−x direction) perpendicular to the first direction;
A first barrier portion 9 provided upstream of the first opening 5 in the second direction and serving as a barrier against airflow flowing in the second direction;
A second barrier portion 10 provided upstream of the second opening 6 in the first direction and serving as a barrier against airflow flowing in the first direction;
Is provided.

Furthermore, the housing 1 is
With respect to the air flow which is provided upstream in the third direction (−y direction) perpendicular to the first direction and the second direction with respect to the first opening 5 and flows in the third direction. A third barrier 12 serving as a barrier;
A fourth barrier portion 13 provided downstream of the second opening 6 in the third direction and serving as a barrier against air flow flowing in the third direction;
Is provided.

  A communication passage 7 that communicates the first opening 5 and the second opening 6 is provided between the first opening 5 and the second opening 6. The communication path 7 is provided with a communication hole 8 communicating with the inside of the housing 1 in which the circuit board 16 is disposed.

  Air flowing in the first direction (−z direction) flows into the communication path 7 from the first opening 5. The air flowing in the direction opposite to the first direction (z direction) hits the barrier portion 10 and flows into the communication passage 7 from the second opening 6.

  Air flowing in the second direction (−x direction) flows into the communication path 7 from the second opening 6. The air flowing in the direction opposite to the second direction (x direction) hits the barrier portion 9 and flows into the communication passage 7 from the first opening 5.

  The air flowing in the third direction (−y direction) hits the barrier portion 13 and flows into the communication passage 7 from the second opening 6. The air flowing in the direction opposite to the first direction (y direction) hits the barrier portion 12 and flows into the communication passage 7 from the first opening 5.

  In this embodiment, as shown in FIG. 2, a water repellent filter 20 is provided in the communication hole 8 in order to prevent water from entering the inside 17 of the housing 1 in which the circuit board 16 is disposed. Further, the electronic component 2a having a large amount of heat generation is arranged near the communication hole 8 with respect to the electronic components 2b and 2c having a small amount of heat generation, thereby facilitating heat dissipation from the electronic component 2a. Further, in order to make it easy for air to enter from the communication hole 8 to the circuit board 16 side, a vent hole may be provided as appropriate. In the case of providing this vent hole, a water repellent filter may be provided also in this vent hole.

  With the configuration as described above, the direction of the air flow that can be taken in from the opening is not limited to one direction with respect to the air flowing around the vehicle-mounted control device. That is, it is possible to deal with flows in various directions. Thereby, the heat dissipation performance of the in-vehicle control device is improved. Moreover, the freedom degree with respect to the attachment angle of the vehicle-mounted control apparatus becomes large.

  About the barrier parts 12 and 13, arrangement | positioning can be changed as shown in FIG. In FIG. 3, a barrier portion (partition) 14 is provided on the housing surface 1 c side of the opening 5. Further, a barrier portion (partition) 15 is provided on the side of the opening 6 opposite to the casing surface 1c (the casing surface 1d side). With this configuration, when air flows in the y direction along the housing surfaces 1 b and 1 f, the air hits the barrier portion 15 and enters the opening 6, and a negative pressure is generated at the opening 5. For this reason, the flow velocity of the air that enters the opening 6 and passes through the through passage 7 and exits to the opening 5 increases.

  When air flows in the −y direction along the housing surfaces 1 b and 1 f, the air hits the barrier portion 14 and enters the opening 5, and a negative pressure is generated at the opening 6. For this reason, the flow velocity of the air that enters the opening 5 and passes through the through passage 7 and exits to the opening 6 increases.

  Hereinafter, Embodiment 2 according to the present invention will be described with reference to FIGS. 5, 6 </ b> A, and 6 </ b> B.

  FIG. 5 is a perspective view showing an embodiment (embodiment 2) of the control device of the present invention. 6A is a cross-sectional view taken along the line AA in FIG. 6B is a cross-sectional view taken along the line BB of FIG.

  In the first embodiment, one communication passage 7 is installed in the housing 1, but two or more communication passages 7 may be installed in the housing 1. When two or more are installed, one communication passage 7 may be divided into two or more.

  In this embodiment, as shown in FIG. 5, the communication passage 7 is divided into two by a partition wall 7c. By dividing the communication path 7 into two by the partition wall 7c, two communication paths 7a and 7b are formed inside the housing 1 as shown in FIGS. 6A and 6B. The partition wall 7 c is provided from the opening 5 to the opening 6. For this reason, the opening part 5 is divided | segmented into the opening part 5a and the opening part 5b by the partition wall 7c. The opening 6 is divided into an opening 6a and an opening 6b by a partition wall 7c.

  In one communication passage 7a, a barrier portion (partition) 21 is provided on the opening 6a side (housing surface 1f side) of the communication hole (vent hole) 8a (FIG. 6A). In the other communication passage 7b, a barrier portion (partition) 22 is provided on the side of the opening 6b of the communication hole (vent hole) 8b (on the side opposite to the housing surface 1f) (FIG. 6B). As a result, the air that has flowed into one communication path (the communication path 7a in FIGS. 6A and 6B) flows out from the other communication path (the communication path 7b in FIGS. 6A and 6B), and fresh air is always supplied. It flows inside the housing 1. Furthermore, by installing a water repellent filter in the communication holes (vent holes) 8a and 8b, it is possible to prevent water from entering the circuit board 16 inside the housing from the vent holes.

  Except for the configuration in which the communication passage 7 is divided into two by the partition wall 7c and the barrier portions 21 and 22, the configuration is the same as that of the first embodiment.

  The partition wall 7c may be provided from the opening 5 to the opening 6 as in the present embodiment, but is provided so that one end or both ends of the partition wall 7c are located on the deeper side of the communication passage 7 than the opening. May be. On the side where the end portion of the partition wall 7c is provided on the deeper side of the communication passage 7 than the opening portion, one opening portion opens in the housing surface.

  According to the above-described embodiments of the present invention, it is possible to radiate heat from the heat radiating component inside the resin casing using the air flow, regardless of the direction of the air flow. Can do. As a result, it is possible to configure a vehicle-mounted control device that can satisfy the requirements for downsizing, cost reduction, and weight reduction by introducing a resin casing.

  In addition, this invention is not limited to each above-mentioned Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Resin housing | casing, 1a ... Fixed side peripheral wall part, 1b ... Anti-fixed side peripheral wall part, 1c, 1d ... Side peripheral wall part, 1e ... 1st end surface wall, 1f ... 2nd end surface wall, 2a, 2b, 2c ... electronic parts, 5 ... opening, 6 ... opening, 7,7a, 7b ... communication passage, 8,8a, 8b ... communication hole, 9,10,12,13,14,15 ... barrier, 16 ... Circuit board, 20... Water repellent filter, 21, 22.

Claims (7)

An in-vehicle control device mounted on an automobile,
Comprising: a circuit board on which the electronic component is provided, and a housing accommodating the circuit board,
The housing is
A first opening for capturing an air flow flowing in a first direction;
A second opening for taking in an air flow flowing in a second direction perpendicular to the first direction;
A first barrier portion provided upstream of the first opening in the second direction and serving as a barrier against airflow flowing in the second direction;
A second barrier portion provided upstream of the second opening in the first direction and serving as a barrier against airflow flowing in the first direction;
With
A vehicle-mounted control device provided with a communication passage that communicates between the first opening and the second opening, and a communication hole that communicates with the interior of the housing in which the circuit board is disposed in the communication passage. . In the vehicle-mounted control apparatus of Claim 1,
Provided on the upstream side in a third direction perpendicular to the first direction and the second direction with respect to the first opening, and a barrier against air flow flowing in the third direction A third barrier portion,
A vehicle-mounted control device comprising: a fourth barrier portion that is provided on the downstream side in the third direction with respect to the second opening portion and serves as a barrier against an air flow flowing in the third direction. . The in-vehicle control device according to claim 2,
A vehicle-mounted control device in which two or more communication passages are installed in the housing. The in-vehicle control device according to claim 3,
One communication path has a barrier portion serving as a barrier against air flow on the upstream side in the air flow direction with respect to the communication hole,
The other communication passage is a vehicle-mounted control device having a barrier portion serving as a barrier against air flow on the downstream side in the air flow direction with respect to the communication hole. In the vehicle-mounted control device according to claim 4,
The communication path is an in-vehicle control device in which two or more communication paths are installed in the casing by dividing one path into two or more. In the vehicle-mounted control apparatus of Claim 1,
A vehicle-mounted control device in which a water repellent filter is installed in the communication hole. The in-vehicle control device according to any one of claims 1 to 6,
A vehicle-mounted control device in which the casing is made of resin.

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