WO2015064203A1 - Vehicle safety device control unit - Google Patents

Vehicle safety device control unit Download PDF

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Publication number
WO2015064203A1
WO2015064203A1 PCT/JP2014/073137 JP2014073137W WO2015064203A1 WO 2015064203 A1 WO2015064203 A1 WO 2015064203A1 JP 2014073137 W JP2014073137 W JP 2014073137W WO 2015064203 A1 WO2015064203 A1 WO 2015064203A1
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WO
WIPO (PCT)
Prior art keywords
circuit board
housing
safety device
vehicle safety
electronic component
Prior art date
Application number
PCT/JP2014/073137
Other languages
French (fr)
Japanese (ja)
Inventor
健太郎 秋山
亜紀 和田
修一 別所
Original Assignee
オートリブ ディベロップメント エービー
健太郎 秋山
亜紀 和田
修一 別所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by オートリブ ディベロップメント エービー, 健太郎 秋山, 亜紀 和田, 修一 別所 filed Critical オートリブ ディベロップメント エービー
Priority to DE112014004998.0T priority Critical patent/DE112014004998T5/en
Priority to JP2015544848A priority patent/JP6000472B2/en
Publication of WO2015064203A1 publication Critical patent/WO2015064203A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P1/00—Details of instruments
    • G01P1/02—Housings
    • G01P1/023—Housings for acceleration measuring devices

Definitions

  • the present invention relates to a vehicle safety device control unit that is equipped with an acceleration sensor or the like that detects acceleration generated in a vehicle at the time of a vehicle collision and controls a vehicle safety device.
  • vehicle safety devices have been developed that are driven according to the direction and degree of impact generated in the vehicle.
  • airbags provided at various locations in the passenger compartment, multistage control airbags that can control the degree of inflation and deployment according to the degree of impact, or seat belt pretensioners that adjust the tension according to the degree of impact.
  • Such a vehicle safety device is generally controlled by an electronic control unit (ECU).
  • the ECU includes a circuit board, an electronic component such as an acceleration sensor that is mounted on the circuit board and detects an impact, and a resin casing (housing) that covers the circuit board surface to protect the electronic component.
  • Patent Document 1 describes a housing that houses a control board as an in-vehicle electronic device.
  • An acceleration sensor for detecting the acceleration at the time of a vehicle collision is mounted on the control board.
  • the housing described in Patent Document 1 includes a case main body, a plurality of brackets extending outward from the side wall of the case main body and fixed to the vehicle, and a plurality of reinforcing ribs extending between the side wall and the bracket of the case main body. I have.
  • Patent Document 1 according to this housing, it is possible to prevent the control board from being destroyed by an impact at the time of a vehicle collision, and to reliably protect the control board.
  • Patent Document 2 discloses an airbag electronic control device in which an angular velocity sensor and an acceleration sensor are mounted in a triangular region surrounded by a fixed point where an electronic board is fixed to a housing. According to Patent Document 2, it is said that vibrations caused by an impact from the outside and the amplitude thereof can be reduced by arranging a sensor in such a region.
  • the present invention has been made in view of such a problem, and an object of the present invention is to provide a vehicle safety device control unit equipped with a sensor that is less susceptible to the adverse effects of vibrations of the vehicle and can output stably.
  • a typical configuration of the present invention includes a circuit board, a sensor mounted on the front or back surface of the circuit board, and a circuit board in a vehicle safety device control unit that controls the vehicle safety device. And a plurality of fixtures for fixing the peripheral edge of the circuit board to the peripheral edge of the casing, and a holding part that is mounted on the surface of the circuit board and extends in the top surface direction of the housing and protrudes from the top surface
  • a triangular pyramid having an apex at an upper end closest to the top surface of the casing of the first electronic component, the surface of the circuit board being perpendicular to the circuit board,
  • a sensor is arranged in an internal space of a triangular pyramid whose bottom surface is a triangle composed of a corner portion of the intersection and two corner portions at positions of two fixtures among a plurality of fixtures.
  • the circuit board is not only fixed to the housing on a plane called the surface of the circuit board by a plurality of fixtures, but also a circuit called the top surface of the housing via the first electronic component. Even at a position away from the surface of the substrate upward, it is held by the housing.
  • the holding points with respect to the casing of the circuit board are arranged in three dimensions.
  • the internal space of the triangular pyramid with the position where the first electronic component on the top surface of the housing is held at the top and the triangle forming the corner at the position of the two fixtures as the bottom is the circuit board and the housing.
  • the sensor is surrounded by holding points that are three-dimensionally dotted with the body, and since the damping effect can be expected at the holding points, it has a solid structure. Since the sensor is arranged in the internal space of the triangular pyramid, the sensor is hardly affected by the vibration of the vehicle, and stable output is possible.
  • the holding portion provided on the top surface of the housing and the first electronic component do not necessarily have to be held completely. This is because even if the holding is such that they can move relatively slightly, on the contrary, the slight movement can be expected to have a damping effect against excess vibration.
  • the output of the sensor can be stabilized without adding a member such as a vibration absorbing material, it is economically advantageous.
  • the triangular pyramid has a solid structure by setting the position of the fixture to the corner of the bottom surface (triangle), but the position of the remaining one corner of the bottom is separated from the apex of the triangular pyramid. Is virtually meaningless.
  • the above intersection is the corner of the triangle, and this is the point closest to the vertex on the surface of the circuit board. Therefore, the internal space of the triangular pyramid is formed near the vertex of the triangular pyramid. As a result, the sensor is arranged in a more rigid space.
  • the first electronic component may have two upper end portions closest to the top surface of the housing, and the triangular pyramid may have the upper end portion farther from the two fixtures out of the two upper end portions.
  • Such a triangular pyramid can also be expected to have a vibration control effect due to the upper end closer to the two fixtures, and the internal space is also widened.
  • another typical configuration of the present invention is a vehicle safety device control unit that controls a vehicle safety device.
  • a circuit board a sensor mounted on the front surface or the back surface of the circuit board,
  • a casing that covers the circuit board, a plurality of fixtures that fix the periphery of the circuit board to the periphery of the casing, and a holding part that is mounted on the surface of the circuit board and extends from the top surface of the casing
  • a sensor is arranged in an inner space of a cone whose bottom is a circle containing the.
  • the circuit board is not only fixed to the housing on a plane called the surface of the circuit board by a plurality of fixtures, but also a circuit called the top surface of the housing via the first electronic component. Even at a position away from the surface of the substrate upward, it is held by the housing.
  • the holding points with respect to the casing of the circuit board are arranged in three dimensions.
  • the internal space of the cone with the position where the first electronic component on the top surface of the housing is held at the top and the bottom including a circle containing at least two fixtures is between the circuit board and the housing. Because it is surrounded by three-dimensionally held holding points, it has a solid structure. Since the sensor is disposed in the inner space of the cone, the sensor is not easily affected by the vibration of the vehicle, and stable output is possible.
  • the holding portion provided on the top surface of the housing and the first electronic component do not necessarily have to be held completely. This is because even if the holding is such that they can move relatively slightly, on the contrary, the slight movement can be expected to have a damping effect against excess vibration.
  • the output of the sensor can be stabilized without adding a member such as a vibration absorbing material, it is economically advantageous.
  • another typical configuration of the present invention is a vehicle safety device control unit that controls a vehicle safety device.
  • a circuit board a sensor mounted on the front surface or the back surface of the circuit board, A casing that covers the circuit board, a plurality of fixtures that fix the periphery of the circuit board to the periphery of the casing, and a holding part that is mounted on the surface of the circuit board and extends from the top surface of the casing
  • a sensor is arranged in an inner space of a cone whose bottom surface is a circle having a radius equal to the distance from the vertex to the intersection.
  • the circuit board is not only fixed to the housing on a plane called the surface of the circuit board by a plurality of fixtures, but also a circuit called the top surface of the housing via the first electronic component. Even at a position away from the surface of the substrate upward, it is held by the housing.
  • the holding points with respect to the casing of the circuit board are arranged in three dimensions.
  • the position where the first electronic component on the top surface of the housing is held is a vertex, and a radius equal to the distance from the vertex to the intersection centered on the intersection of the perpendicular line from the vertex to the circuit board surface.
  • the inner space of the cone whose bottom is a circle having a circle is surrounded by holding points that are three-dimensionally scattered between the circuit board and the housing, and thus has a solid structure.
  • the circle which is the bottom surface is set at a position away from the apex, or is enlarged without limit, it is practically that the circle extends into a structurally non-rigid area and the circle encloses the fixture. Makes no sense.
  • the above intersection is the center of the circle, which is the point closest to the vertex on the surface of the circuit board.
  • the radius of the circle is also made equal to the distance from the vertex to the intersection, that is, the height of the cone, so that the circle does not become unlimited.
  • the inner space of the cone is formed in the vicinity of the apex of the cone, and the sensor is arranged in a more rigid space. Since the sensor is disposed in the inner space of the cone, the sensor is not easily affected by the vibration of the vehicle, and stable output is possible.
  • the holding portion provided on the top surface of the housing and the first electronic component do not necessarily have to be held completely. This is because even if the holding is such that they can move relatively slightly, on the contrary, the slight movement can be expected to have a damping effect against excess vibration.
  • the output of the sensor can be stabilized without adding a member such as a vibration absorbing material, it is economically advantageous.
  • the vehicle safety device control unit further includes a second electronic component attached to the top surface of the housing and having a lead wire, and the upper end of the first electronic component is connected to the lead wire of the second electronic component.
  • a terminal that is electrically connected and is held by a holding portion protruding from the top surface of the housing may be formed.
  • the first electronic component plays a role in electrically connecting the second electronic component attached to the top surface of the housing for some reason, such as a lack of space on the circuit board. .
  • the sensor is placed in the vicinity to stabilize the output of the sensor. Can do.
  • the second electronic component may be a capacitor, and the sensor may be an acceleration sensor.
  • a vehicle safety device control unit equipped with a sensor that is less susceptible to the adverse effects of vehicle vibrations and that can output stably.
  • FIG. 3 is a completed view of the ECU of FIG. 2.
  • FIG. 3 is a perspective view of a circuit board and a housing of FIG. 2.
  • FIG. 4 is a perspective view illustrating an AA cross section of FIG. 3.
  • FIG. 5 is a perspective view illustrating a state in which the domino of FIG. 4 is held in a housing. It is an enlarged view of the circuit board of FIG. It is a top view of the circuit board of FIG. It is a side view of the circuit board of FIG.
  • FIG. 10 is a plan view of the circuit board of FIG. 9.
  • FIG. 12 is a graph showing the frequency response simulation analysis results of the two acceleration sensors in FIG. 11, and showing the X / Y / Z-axis direction fluctuation of each sensor mounting position with respect to the input in the X-axis direction as an output.
  • FIG. 12 is a graph showing the frequency response simulation analysis results of the two acceleration sensors in FIG. 11, and showing the X / Y / Z-axis direction fluctuations of the respective sensor mounting positions with respect to the input in the Y-axis direction as outputs.
  • FIG. FIG. 12 is a graph showing the results of frequency response simulation analysis of the two acceleration sensors in FIG. 11, and showing the X / Y / Z-axis direction fluctuations of the sensor mounting positions with respect to the input in the Z-axis direction as outputs.
  • FIG. 12 is a graph showing the frequency response simulation analysis results of the two acceleration sensors in FIG. 11, and showing the X / Y / Z-axis direction fluctuations of the sensor mounting positions with respect to the input in the Z-axis direction as
  • FIG. 1 is a diagram exemplifying an arrangement in a vehicle 101 of an ECU (Electronic Control Unit) 114 that is an embodiment of a vehicle safety device control unit according to the present invention.
  • the vehicle 101 includes an airbag 100 and a seat belt pretensioner (hereinafter, pretensioners 102A and 102B) as safety devices.
  • pretensioners 102A and 102B seat belt pretensioner
  • the airbag 100 includes a front airbag 106 installed on the steering wheel 104, a passenger airbag 107 installed on the front left seat, and curtain airbags 108A and 108B installed on the side of the passenger compartment. .
  • the airbag 100 and the pretensioners 102A and 102B are controlled by the ECU 114. More specifically, it operates due to the detection of an impact by an acceleration sensor 150 mounted on the ECU 114, or a yaw rate sensor, a rollover sensor, or the like (not shown).
  • the front airbag 106 can be controlled in multiple stages, and the degree of inflation and deployment can be controlled in accordance with the degree of acceleration generated in the vehicle 101, that is, the degree of impact.
  • FIG. 2 is an assembly diagram of the ECU 114 of FIG.
  • the ECU 114 includes a circuit board 116, a resin casing 120 that covers the surface 118 of the circuit board 116 (the lower side of the board 116 in FIG. 2), and a metal cover 124 that is fixed to the back surface 122 of the circuit board 116.
  • the circuit board 116 side of the housing 120 is open.
  • the cover 124, the circuit board 116, and the housing 120 are fixed by screws 130A, 130B, 130C, and 130D as fixing tools.
  • the peripheral edge of the circuit board 116 is fixed to the side walls 132, 134, and 136 of the peripheral edge portion of the housing 120.
  • FIG. 3 is a completed view of the ECU 114 of FIG. FIG. 3 illustrates a state where the ECU 114 of FIG. 2 is turned upside down.
  • the surface 118 of the circuit board 116 covered with the housing 120 is not visible, and only the connector 138 provided on the circuit board 116 is exposed from the end of the housing 120.
  • the cover 124 is hardly visible, and only the flanges 140 and 142 provided on both sides of the cover 124 are exposed.
  • the ECU 114 is fastened to the vehicle body by screws or the like (not shown) through holes 144, 146, 148 provided in the flanges 140, 142.
  • FIG. 4 is a perspective view of the circuit board 116 and the housing 120 of FIG.
  • FIG. 4 illustrates a state in which the circuit board 116 is turned upside down as illustrated in FIG. 2 and the surface 118 faces upward.
  • the ECU 114 includes an acceleration sensor 150 mounted on the surface 118 of the circuit board 116.
  • the acceleration sensor 150 may be mounted on the back surface 122 of the circuit board 116.
  • FIG. 5 is a perspective view illustrating an AA cross section of FIG.
  • the ECU 114 includes various electronic components, but in the drawings of the present application, only the electronic components directly related to the present invention are illustrated, and the other components are not shown.
  • the ECU 114 includes a domino 154 as a first electronic component.
  • the domino 154 is a type of terminal that electrically connects the capacitor 164 disposed on the top surface 152 of the housing 120 as the second electronic component to the circuit board 116.
  • the domino 154 is mounted on the surface 118 of the circuit board 116 as illustrated in FIG. As illustrated in FIG. 5, the domino 154 extends to the holding portions 163 and 165 protruding from the top surface 152 of the housing 120 and is held on the top surface 152 in a state where the ECU 114 is assembled.
  • two forked terminals 156 and 158 are formed at the upper end of the domino 154, and the ends of the terminals 156 and 158 of the domino 154 are closest to the top surface 152 of the housing 120.
  • a capacitor 164 having lead wires 160 and 162 is attached to the top surface 152 of the housing 120.
  • the terminals 156 and 158 at the upper end of the domino 154 are electrically connected so as to sandwich the lead wires 160 and 162 of the capacitor 164 and inserted into the holding portions 163 and 165 protruding from the top surface 152. Is done.
  • the lead wires 160 and 162 of the capacitor 164 are held in the housing 120.
  • the terminals 156 and 158 and the holding portions 163 and 165 are partially obstructed and cannot be seen.
  • FIG. 6 is a partially enlarged view of FIG. 5, illustrating a state in which the domino 154 is held in the housing 120.
  • the procedure for holding the circuit board 116 in the housing 120 via the domino 154 is as follows. First, after the capacitor 164 is incorporated into the housing 120, the circuit board 116 on which the domino 154 is mounted is inserted into the housing 120. In this process, the terminals 156 and 158 at the upper end of the domino 154 are engaged with the lead wires 160 and 162 of the capacitor 164, and the domino 154 is pushed toward the top surface 150 of the housing 120.
  • the lead wires 160 and 162 of the capacitor 164 are pressed to the innermost part of the slits 167 and 169 formed by the holding portions 163 and 165 of the housing 120.
  • the casing 120, the lead wires 160 and 162 of the capacitor 164, the domino 154, and the circuit board 116 are pressed against each other in the vertical direction of the ECU 114.
  • the circuit board 116 is held on the housing 120 via the domino 154.
  • the shapes of the domino 154 and its bifurcated terminals 156, 158 are merely examples, and may have any shape as long as they are held on the casing 120 top surface 152 side.
  • FIG. 7 is an enlarged view of the circuit board 116 of FIG. 4, and is a diagram illustrating the first embodiment of the present invention.
  • the acceleration sensor 150 includes a position where the domino 154 is held by the holding portions 163 and 165 of the top surface 152 of the casing 120 illustrated in FIGS. 4 and 5 (in this embodiment, the terminal 156 It is arranged in the internal space of the triangular pyramid 170 having the apex 166 as a vertex.
  • This “arranged” means that the whole or most of the acceleration sensor 150 is preferably included in the internal space of the triangular pyramid 170, but a part of the acceleration sensor 150 is included in the internal space of the triangular pyramid 170. Including the state that has been.
  • the triangular pyramid 170 is a triangular pyramid whose bottom surface is a triangle that forms corners 172 and 174 at the positions of two screws 130A and 130B (not shown in FIG. 7) that are closest to the apex 166 of the triangular pyramid 170.
  • the internal space of the triangular pyramid 170 is preferably formed in the vicinity of the holding point (the tip of the terminal 156) added between the circuit board 116 and the housing 120, that is, the apex 166 of the triangular pyramid 170.
  • a triangular pyramid 170 is assumed in which the tip of the terminal 156 farther from the two screws 130A and 130B out of the two terminals 156 and 158 is the vertex 166.
  • Such a triangular pyramid 170 can also be expected to have a vibration damping effect by the terminal 158 closer to the two screws 130A and 130B, and the internal space is also widened.
  • a triangular pyramid with the tip of the terminal 158 as a vertex may be used.
  • FIG. 8 is a plan view of the circuit board 116 of FIG.
  • the triangle which is the bottom surface of the triangular pyramid 170 has a corner 176 at the intersection of the perpendicular 180 (FIG. 7) from the vertex 166 to the circuit board 116 and the surface 118 of the circuit board 116. Accordingly, when the circuit board 116 is viewed from directly above as illustrated in FIG. 8, the apex 166 of the triangular pyramid 170 and the triangular corner 176 which is the bottom surface appear to overlap, and at this time, the corner 176 and the corner 172, A triangle formed by 174 is the bottom surface of the triangular pyramid 170.
  • the circuit board 116 is attached to the casing 120 on the plane of the surface 118 of the circuit board 116 by the screws 130A, 130B, 130C, and 130D as illustrated in FIGS. It is not only fixed. That is, as illustrated in FIG. 5, the circuit board 116 is further spaced apart from the front surface 118 of the circuit board 116 by a three-dimensional position in the direction of the top surface 152 of the housing 120 via the domino 154 (see FIG. 5). 7 at the apex 166 of the triangular pyramid 170, etc.). By adding such a holding point, the fixing of the circuit board 116 to the housing 120 is three-dimensionally constructed.
  • the internal space of the triangular pyramid 170 is surrounded by holding points (vertex 166, corner portions 172, 174) that are three-dimensionally scattered between the circuit board 116 and the housing 120, so that a solid structure can be obtained.
  • the holding point is expected to have a damping effect, and the acceleration sensor 150 is disposed in the internal space of the triangular pyramid 170, so that the acceleration sensor 150 is not easily affected by the vibration of the vehicle and can output stably. Become.
  • the holding portions 163 and 165 and the domino 154 provided on the top surface 152 of the housing 120 are not necessarily held (fixed) completely. This is because even if the holding is such that they can move relatively slightly, on the contrary, the slight movement can be expected to have a damping effect against excess vibration.
  • the output of the acceleration sensor 150 can be stabilized without adding a member such as a vibration absorbing material, which is economically advantageous.
  • the triangular pyramid 170 has a solid structure by setting the positions of the screws 130A and 130B to the corners of the bottom surface (triangle), but the remaining one corner 176 of the bottom surface is also formed on the surface of the circuit board 116.
  • FIG. 9 is a side view of the circuit board 116 of FIG. 4, and is a diagram illustrating a second embodiment of the present invention.
  • the acceleration sensor 150 includes the position where the domino 154 is held on the top surface 152 of the housing 120 illustrated in FIGS. 4 and 5 (in the present embodiment, just the tips of the terminals 156 and 158). It is arranged in the internal space of the cone 190 with the middle point as the vertex 186. This “arranged” means that the whole or most of the acceleration sensor 150 is preferably included in the internal space of the cone 190, but a part of the acceleration sensor 150 is included in the internal space of the cone 190. Including the state.
  • FIG. 10 is a plan view of the circuit board 116 of FIG.
  • the cone 190 is a cone whose bottom surface is a circle containing the two screws 130 ⁇ / b> A and 130 ⁇ / b> B closest to the apex 186 of the cone 190.
  • the internal space of the cone 190 is formed in the vicinity of the holding point (three-dimensionally added between the tips of the terminals 156 and 158) added between the circuit board 116 and the housing 120, that is, in the vicinity of the apex 186 of the cone 190. Is desirable.
  • a cone 190 having a vertex 186 at the very middle of the ends of the terminals 156 and 158 is assumed.
  • a cone having the tip of the terminal 156 or 158 as a vertex may be used.
  • the circle which is the bottom surface of the cone 190 is centered at the intersection point of the perpendicular line 200 from the vertex 186 to the circuit board 116 with the surface 118 of the circuit board 116, and the distance from the vertex 186 to the intersection point. It has a radius H equal to H. Accordingly, when the circuit board 116 is viewed from directly above as illustrated in FIG. 10, the apex 186 of the cone 190 and the center 202 of the circle that is the bottom surface appear to overlap.
  • the circuit board 116 is attached to the casing 120 on the plane of the surface 118 of the circuit board 116 by the screws 130A, 130B, 130C, and 130D as illustrated in FIGS. It is not only fixed. That is, as illustrated in FIG. 5, the circuit board 116 is further spaced apart from the surface 118 of the circuit board 116, which is the top surface 152 of the housing 120, via the domino 154 (the apex of the triangular pyramid 170 in FIG. 7. 166) and the like are also held by the housing 120. By adding such a holding point, the fixing of the circuit board 116 to the housing 120 is three-dimensionally constructed.
  • the inner space of the cone 190 is surrounded by holding points (vertex 186, screws 130A, 130B) three-dimensionally scattered between the circuit board 116 and the housing 120, and thus has a solid structure.
  • a vibration damping effect is expected at the holding point, and since the acceleration sensor 150 is disposed in the inner space of the cone 190, the acceleration sensor 150 is not easily affected by the vibration of the vehicle and can output stably. .
  • the output of the acceleration sensor 150 can be stabilized without adding a member such as a vibration absorbing material, which is economically advantageous.
  • the cone 190 has a rigid structure with the bottom surface containing the screws 130 ⁇ / b> A and 130 ⁇ / b> B.
  • the center 202 of the bottom surface is also a point closest to the apex 186 of the cone 190 on the surface 118 of the circuit board 116. It is.
  • the radius of the circle that is the bottom surface is equal to the height H of the cone 190. Therefore, the internal space of the cone 190 is formed in the vicinity of the vertex 186.
  • the domino 154 electrically connects the capacitor 164 attached to the top surface 152 of the housing 120 to the circuit board 116 for some reason, such as when the space of the circuit board 116 is insufficient. Play the role of connecting.
  • the acceleration sensor 150 is disposed in the vicinity thereof, and thereby the output of the acceleration sensor 150 is obtained. It can be stabilized.
  • FIG. 11 is a plan view of the ECU 214 in which another acceleration sensor 151 is added to the circuit board 116 of FIG.
  • FIG. 11A shows a state where the housing 120 covers the surface 118 of the circuit board 116
  • FIG. 11B shows a state where the housing 120 is removed from the circuit board 116.
  • the acceleration sensor 151 is not arranged in the internal space of the triangular pyramid 170 or the cone 190 exemplified in the first and second embodiments, respectively.
  • FIGS. 12 to 14 show frequency response simulation analysis results of the two acceleration sensors shown in FIG.
  • FIG. 12 is a graph showing, as an output, fluctuations in the X / Y / Z-axis direction of the mounting positions of the acceleration sensors 150 and 151 with respect to the input in the X-axis direction to the ECU 214.
  • the Z-axis direction is a direction orthogonal to the paper surface of FIG.
  • FIG. 13 is a graph showing, as an output, fluctuations in the X / Y / Z axis directions of the mounting positions of the acceleration sensors 150 and 151 with respect to the input in the Y axis direction to the ECU 214.
  • FIG. 12 is a graph showing, as an output, fluctuations in the X / Y / Z-axis direction of the mounting positions of the acceleration sensors 150 and 151 with respect to the input in the Y axis direction to the ECU 214.
  • 14 is a graph showing, as an output, fluctuations in the X / Y / Z-axis direction of the mounting positions of the acceleration sensors 150 and 151 with respect to the input to the ECU 214 in the Z-axis direction. 12 to 14, the vertical axis represents acceleration output, and the horizontal axis represents frequency.
  • FIG. 12A, FIG. 13A, and FIG. 14A respectively, the fluctuation in the X-axis direction with respect to the input in the X / Y / Z-axis direction is almost the same in both the acceleration sensors 150 and 151. There is no difference.
  • FIGS. 12 (b) (c), 13 (b) (c) and 14 (b) (c) respectively, the input in the Y / Z axis direction with respect to the input in the X / Y / Z axis direction is illustrated.
  • the acceleration sensor 150 shows a lower value than the acceleration sensor 151 in most frequency regions.
  • the output of the acceleration sensor 150 arranged in the internal space of the triangular pyramid 170 or the cone 190 exemplified in the first and second embodiments of the present invention is arranged outside the internal space. It can be seen that the output of the acceleration sensor 151 is less susceptible to vibration.
  • the present invention can be used in a vehicle safety device control unit that controls a vehicle safety device by mounting an acceleration sensor or the like that detects acceleration generated in the vehicle at the time of a vehicle collision.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting Of Printed Circuit Boards And The Like (AREA)
  • Vibration Prevention Devices (AREA)
  • Regulating Braking Force (AREA)

Abstract

[Problem] To provide a vehicle safety device control unit having an on-board sensor that is not susceptible to the adverse effects of vehicle vibration and that is capable of stable output. [Solution] An ECU (114) is provided with a circuit board (116), an acceleration sensor (150) mounted on the front surface or the back surface of the circuit board (116), a chassis (120) which covers the circuit board, screws (130A, 130B, 130C, 130D) that fasten the peripheral edge of the circuit board to the side wall of the peripheral part of the chassis, and a domino (154) that is mounted on the front surface of the circuit board, and is retained by retainers (163, 165) that extend in the top surface (152) direction of the chassis and protrude from the top surface. The acceleration sensor (150) is arranged in the interior space of a triangular pyramid (170), the apex (166) of which is the upper end of the domino closest to the top surface of the chassis, the triangular pyramid having as the bottom surface a triangle constituted from a corner part (176) at the intersection of a vertical line (180) leading from the apex towards the circuit board, and the surface of the circuit board, and two corner parts (172, 174) at the locations of two of the screws (130A, 130B).

Description

車両安全装置制御ユニットVehicle safety device control unit
　本発明は、車両衝突時に車両に生じた加速度を検出する加速度センサ等を搭載し、車両用安全装置を制御する車両安全装置制御ユニットに関するものである。 The present invention relates to a vehicle safety device control unit that is equipped with an acceleration sensor or the like that detects acceleration generated in a vehicle at the time of a vehicle collision and controls a vehicle safety device.
　近年、車両に生じた衝撃の方向やその度合い等に応じて駆動される車両用安全装置が開発されている。例えば車室内の様々な箇所に備えられるエアバッグや、衝撃の度合いに応じて膨張展開の度合いが制御できる多段階制御エアバッグ、または衝撃の度合いに応じて張力を調節するシートベルトプリテンショナ等が挙げられる。かかる車両用安全装置は、一般的に、電子制御ユニット（ＥＣＵ：Electronic Control Unit）によって制御される。ＥＣＵは、回路基板と、回路基板に搭載され衝撃を検知する加速度センサ等の電子部品と、回路基板表面を被覆して電子部品を保護する樹脂製の筐体（ハウジング）とによって構成される。 In recent years, vehicle safety devices have been developed that are driven according to the direction and degree of impact generated in the vehicle. For example, there are airbags provided at various locations in the passenger compartment, multistage control airbags that can control the degree of inflation and deployment according to the degree of impact, or seat belt pretensioners that adjust the tension according to the degree of impact. Can be mentioned. Such a vehicle safety device is generally controlled by an electronic control unit (ECU). The ECU includes a circuit board, an electronic component such as an acceleration sensor that is mounted on the circuit board and detects an impact, and a resin casing (housing) that covers the circuit board surface to protect the electronic component.
　例えば特許文献１には、車載用電子機器としての制御基板を収容する筐体が記載されている。この制御基板には、車両衝突時の加速度を検出する加速度センサが実装されている。特許文献１に記載の筐体は、ケース本体と、ケース本体の側壁から外側に延びていて車両に固定される複数のブラケットと、ケース本体の側壁とブラケットとの間にわたる複数の補強リブとを備えている。特許文献１では、この筐体によれば、車両衝突時の衝撃により制御基板が破壊されることを防止し、制御基板を確実に保護できるとしている。 For example, Patent Document 1 describes a housing that houses a control board as an in-vehicle electronic device. An acceleration sensor for detecting the acceleration at the time of a vehicle collision is mounted on the control board. The housing described in Patent Document 1 includes a case main body, a plurality of brackets extending outward from the side wall of the case main body and fixed to the vehicle, and a plurality of reinforcing ribs extending between the side wall and the bracket of the case main body. I have. In Patent Document 1, according to this housing, it is possible to prevent the control board from being destroyed by an impact at the time of a vehicle collision, and to reliably protect the control board.
　特許文献２には、電子基板が筐体に固定される固定点で囲まれた三角形の領域に角速度センサと加速度センサを実装するエアバッグ電子制御装置が開示されている。特許文献２によれば、かかる領域にセンサを配置することで外部からの衝撃による振動とその振幅を低減できるとしている。 Patent Document 2 discloses an airbag electronic control device in which an angular velocity sensor and an acceleration sensor are mounted in a triangular region surrounded by a fixed point where an electronic board is fixed to a housing. According to Patent Document 2, it is said that vibrations caused by an impact from the outside and the amplitude thereof can be reduced by arranging a sensor in such a region.
特開２０１０－２４１２４９号公報JP 2010-241249 A 特開２０１１－７５４４２号公報JP 2011-75442 A
　エアバッグ等の安全装置が必要時に適切に駆動するよう、ＥＣＵの回路基板に実装された加速度センサ等の出力には信頼性が求められる。しかし車両の振動によって、加速度センサ等の電子部品の出力が不安定になるおそれがある。とりわけ加速度センサは、その姿勢の変化によって加速度の正確な検出が不可能となるため、回路基板に堅固に保持する必要がある。特許文献１または特許文献２に記載の技術によれば、外部からの衝撃によって基板上のセンサ類に加わる振動はある程度低減されると思われるが、さらに改善の余地がある。 Reliability is required for the output of the acceleration sensor and the like mounted on the circuit board of the ECU so that a safety device such as an air bag is properly driven when necessary. However, the output of electronic components such as an acceleration sensor may become unstable due to vehicle vibration. In particular, the acceleration sensor needs to be firmly held on the circuit board because it is impossible to accurately detect acceleration due to a change in posture. According to the technique described in Patent Document 1 or Patent Document 2, it is considered that the vibration applied to the sensors on the substrate due to an external impact is reduced to some extent, but there is still room for improvement.
　本発明は、このような課題に鑑み、車両の振動による悪影響を受けにくく安定した出力が可能なセンサを搭載した車両安全装置制御ユニットを提供することを目的としている。 The present invention has been made in view of such a problem, and an object of the present invention is to provide a vehicle safety device control unit equipped with a sensor that is less susceptible to the adverse effects of vibrations of the vehicle and can output stably.
　上記課題を解決するために、本発明の代表的な構成は、車両用安全装置を制御する車両安全装置制御ユニットにおいて、回路基板と、回路基板の表面または裏面に搭載されたセンサと、回路基板を被覆する筐体と、回路基板の周縁を筐体の周縁部に固定する複数の固定具と、回路基板の表面に搭載され筐体の天面方向に延び天面から突出する保持部に保持される第１の電子部品とを備え、第１の電子部品の筐体の天面に最も近い上端部を頂点とする三角錐であって、頂点から回路基板に向かう垂線の回路基板の表面との交点の角部と、複数の固定具のうち２つの固定具の位置の２つの角部から構成される三角形を底面とする三角錐の内部空間にセンサが配置されていることを特徴とする。 In order to solve the above-described problems, a typical configuration of the present invention includes a circuit board, a sensor mounted on the front or back surface of the circuit board, and a circuit board in a vehicle safety device control unit that controls the vehicle safety device. And a plurality of fixtures for fixing the peripheral edge of the circuit board to the peripheral edge of the casing, and a holding part that is mounted on the surface of the circuit board and extends in the top surface direction of the housing and protrudes from the top surface A triangular pyramid having an apex at an upper end closest to the top surface of the casing of the first electronic component, the surface of the circuit board being perpendicular to the circuit board, A sensor is arranged in an internal space of a triangular pyramid whose bottom surface is a triangle composed of a corner portion of the intersection and two corner portions at positions of two fixtures among a plurality of fixtures. .
　上記構成によれば、回路基板は、複数の固定具によって回路基板の表面という平面上で筐体に固定されるだけでなく、第１の電子部品を介してさらに、筐体の天面という回路基板の表面から上方に離れた位置においても筐体に保持される。かかる保持点の追加によって回路基板の筐体に対する保持点は立体的に配置されることとなる。とりわけ、筐体の天面の第１の電子部品が保持された位置を頂点とし、２つの固定具の位置に角部を形成する三角形を底面とする三角錐の内部空間は、回路基板と筐体との間に立体的に点在する保持点で囲まれていて、保持点には制振効果が見込めるため、堅固な構造を有する。かかる三角錐の内部空間にセンサが配置されているため、センサは車両の振動による悪影響を受けにくく、安定した出力が可能となる。 According to the above configuration, the circuit board is not only fixed to the housing on a plane called the surface of the circuit board by a plurality of fixtures, but also a circuit called the top surface of the housing via the first electronic component. Even at a position away from the surface of the substrate upward, it is held by the housing. By adding such holding points, the holding points with respect to the casing of the circuit board are arranged in three dimensions. In particular, the internal space of the triangular pyramid with the position where the first electronic component on the top surface of the housing is held at the top and the triangle forming the corner at the position of the two fixtures as the bottom is the circuit board and the housing. It is surrounded by holding points that are three-dimensionally dotted with the body, and since the damping effect can be expected at the holding points, it has a solid structure. Since the sensor is arranged in the internal space of the triangular pyramid, the sensor is hardly affected by the vibration of the vehicle, and stable output is possible.
　なお、筐体の天面に設けられた保持部と第１の電子部品とは、必ずしも完全に保持されていなくてもよい。それらが相対的にわずかに動くことができるような保持であっても、逆に、そのわずかな動きによって余分な振動に対する制振効果が見込めるからである。 Note that the holding portion provided on the top surface of the housing and the first electronic component do not necessarily have to be held completely. This is because even if the holding is such that they can move relatively slightly, on the contrary, the slight movement can be expected to have a damping effect against excess vibration.
　また上記構成によれば、振動吸収材などの部材を追加することなくセンサの出力を安定させることができるため、経済的にも有利である。 Further, according to the above configuration, since the output of the sensor can be stabilized without adding a member such as a vibration absorbing material, it is economically advantageous.
　また三角錐は、固定具の位置を底面（三角形）の角部とすることで堅固な構造となっているが、底面の残りの１つの角部の位置が三角錐の頂点から離れてしまっては、実質的に意味をなさない。その点、本発明では、上記の交点を三角形の角部としていて、これは回路基板の表面における頂点から最も近い点であるため、三角錐の内部空間は、三角錐の頂点の近傍に形成されることとなり、センサはより堅固な空間に配置されることとなる。 In addition, the triangular pyramid has a solid structure by setting the position of the fixture to the corner of the bottom surface (triangle), but the position of the remaining one corner of the bottom is separated from the apex of the triangular pyramid. Is virtually meaningless. In that respect, in the present invention, the above intersection is the corner of the triangle, and this is the point closest to the vertex on the surface of the circuit board. Therefore, the internal space of the triangular pyramid is formed near the vertex of the triangular pyramid. As a result, the sensor is arranged in a more rigid space.
　第１の電子部品は、筐体の天面に最も近い上端部を２つ有し、三角錐は、２つの上端部のうち、２つの固定具からより遠い上端部を頂点とするとよい。かかる三角錐は、２つの固定具からより近い上端部による制振効果も見込め、内部空間も広くなる。 The first electronic component may have two upper end portions closest to the top surface of the housing, and the triangular pyramid may have the upper end portion farther from the two fixtures out of the two upper end portions. Such a triangular pyramid can also be expected to have a vibration control effect due to the upper end closer to the two fixtures, and the internal space is also widened.
　上記課題を解決するために、本発明の他の代表的な構成は、車両用安全装置を制御する車両安全装置制御ユニットにおいて、回路基板と、回路基板の表面または裏面に搭載されたセンサと、回路基板を被覆する筐体と、回路基板の周縁を筐体の周縁部に固定する複数の固定具と、回路基板の表面に搭載され筐体の天面方向に延び天面から突出する保持部に保持される第１の電子部品とを備え、第１の電子部品が保持された位置を頂点とする円錐であって、複数の固定具のうち第１の電子部品に近い少なくとも２つの固定具を内包する円を底面とする円錐の内部空間にセンサが配置されていることを特徴とする。 In order to solve the above problems, another typical configuration of the present invention is a vehicle safety device control unit that controls a vehicle safety device. In the vehicle safety device control unit, a circuit board, a sensor mounted on the front surface or the back surface of the circuit board, A casing that covers the circuit board, a plurality of fixtures that fix the periphery of the circuit board to the periphery of the casing, and a holding part that is mounted on the surface of the circuit board and extends from the top surface of the casing And at least two fixtures close to the first electronic component among the plurality of fixtures, the first electronic component being held in the cone, and having a vertex at the position where the first electronic component is held A sensor is arranged in an inner space of a cone whose bottom is a circle containing the.
　上記構成によれば、回路基板は、複数の固定具によって回路基板の表面という平面上で筐体に固定されるだけでなく、第１の電子部品を介してさらに、筐体の天面という回路基板の表面から上方に離れた位置においても筐体に保持される。かかる保持点の追加によって回路基板の筐体に対する保持点は立体的に配置されることとなる。とりわけ、筐体の天面の第１の電子部品が保持された位置を頂点とし、少なくとも２つの固定具を内包する円を底面とする円錐の内部空間は、回路基板と筐体との間に立体的に点在する保持点で囲まれているため、堅固な構造を有する。かかる円錐の内部空間にセンサが配置されているため、センサは車両の振動による悪影響を受けにくく、安定した出力が可能となる。 According to the above configuration, the circuit board is not only fixed to the housing on a plane called the surface of the circuit board by a plurality of fixtures, but also a circuit called the top surface of the housing via the first electronic component. Even at a position away from the surface of the substrate upward, it is held by the housing. By adding such holding points, the holding points with respect to the casing of the circuit board are arranged in three dimensions. In particular, the internal space of the cone with the position where the first electronic component on the top surface of the housing is held at the top and the bottom including a circle containing at least two fixtures is between the circuit board and the housing. Because it is surrounded by three-dimensionally held holding points, it has a solid structure. Since the sensor is disposed in the inner space of the cone, the sensor is not easily affected by the vibration of the vehicle, and stable output is possible.
　なお、筐体の天面に設けられた保持部と第１の電子部品とは、必ずしも完全に保持されていなくてもよい。それらが相対的にわずかに動くことができるような保持であっても、逆に、そのわずかな動きによって余分な振動に対する制振効果が見込めるからである。 Note that the holding portion provided on the top surface of the housing and the first electronic component do not necessarily have to be held completely. This is because even if the holding is such that they can move relatively slightly, on the contrary, the slight movement can be expected to have a damping effect against excess vibration.
　また上記構成によれば、振動吸収材などの部材を追加することなくセンサの出力を安定させることができるため、経済的にも有利である。 Further, according to the above configuration, since the output of the sensor can be stabilized without adding a member such as a vibration absorbing material, it is economically advantageous.
　上記課題を解決するために、本発明の他の代表的な構成は、車両用安全装置を制御する車両安全装置制御ユニットにおいて、回路基板と、回路基板の表面または裏面に搭載されたセンサと、回路基板を被覆する筐体と、回路基板の周縁を筐体の周縁部に固定する複数の固定具と、回路基板の表面に搭載され筐体の天面方向に延び天面から突出する保持部に保持される第１の電子部品とを備え、第１の電子部品が保持された位置を頂点とする円錐であって、頂点から回路基板に向かう垂線の回路基板の表面との交点を中心とし頂点から交点までの距離に等しい半径を有する円を底面とする円錐の内部空間にセンサが配置されていることを特徴とする。 In order to solve the above problems, another typical configuration of the present invention is a vehicle safety device control unit that controls a vehicle safety device. In the vehicle safety device control unit, a circuit board, a sensor mounted on the front surface or the back surface of the circuit board, A casing that covers the circuit board, a plurality of fixtures that fix the periphery of the circuit board to the periphery of the casing, and a holding part that is mounted on the surface of the circuit board and extends from the top surface of the casing A first electronic component held at the top of the circuit board, the cone having a vertex at the position where the first electronic component is held, and centering on an intersection with a surface of the circuit board perpendicular to the circuit board A sensor is arranged in an inner space of a cone whose bottom surface is a circle having a radius equal to the distance from the vertex to the intersection.
　上記構成によれば、回路基板は、複数の固定具によって回路基板の表面という平面上で筐体に固定されるだけでなく、第１の電子部品を介してさらに、筐体の天面という回路基板の表面から上方に離れた位置においても筐体に保持される。かかる保持点の追加によって回路基板の筐体に対する保持点は立体的に配置されることとなる。とりわけ、筐体の天面の第１の電子部品が保持された位置を頂点とし、頂点から回路基板に向かう垂線の回路基板の表面との交点を中心とし頂点から交点までの距離に等しい半径を有する円を底面とする円錐の内部空間は、回路基板と筐体との間に立体的に点在する保持点で囲まれているため、堅固な構造を有する。 According to the above configuration, the circuit board is not only fixed to the housing on a plane called the surface of the circuit board by a plurality of fixtures, but also a circuit called the top surface of the housing via the first electronic component. Even at a position away from the surface of the substrate upward, it is held by the housing. By adding such holding points, the holding points with respect to the casing of the circuit board are arranged in three dimensions. In particular, the position where the first electronic component on the top surface of the housing is held is a vertex, and a radius equal to the distance from the vertex to the intersection centered on the intersection of the perpendicular line from the vertex to the circuit board surface. The inner space of the cone whose bottom is a circle having a circle is surrounded by holding points that are three-dimensionally scattered between the circuit board and the housing, and thus has a solid structure.
　上記の円錐は、底面である円を頂点から離れた位置に設定したり、際限なく大きくしたりすれば、構造的に堅固でない領域にも円が及び、円が固定具を内包したことが実質的に意味をなさない。その点、本発明では、上記の交点を円の中心としていて、これは回路基板の表面における頂点から最も近い点である。また、円の半径も、頂点から交点までの距離、すなわち円錐の高さと等しくすることで、無制限に広い円とならない。これにより、円錐の内部空間は、円錐の頂点の近傍に形成されることとなり、センサはより堅固な空間に配置されることとなる。かかる円錐の内部空間にセンサが配置されているため、センサは車両の振動による悪影響を受けにくく、安定した出力が可能となる。 In the above cone, if the circle which is the bottom surface is set at a position away from the apex, or is enlarged without limit, it is practically that the circle extends into a structurally non-rigid area and the circle encloses the fixture. Makes no sense. In this regard, in the present invention, the above intersection is the center of the circle, which is the point closest to the vertex on the surface of the circuit board. The radius of the circle is also made equal to the distance from the vertex to the intersection, that is, the height of the cone, so that the circle does not become unlimited. Thereby, the inner space of the cone is formed in the vicinity of the apex of the cone, and the sensor is arranged in a more rigid space. Since the sensor is disposed in the inner space of the cone, the sensor is not easily affected by the vibration of the vehicle, and stable output is possible.
　なお、筐体の天面に設けられた保持部と第１の電子部品とは、必ずしも完全に保持されていなくてもよい。それらが相対的にわずかに動くことができるような保持であっても、逆に、そのわずかな動きによって余分な振動に対する制振効果が見込めるからである。 Note that the holding portion provided on the top surface of the housing and the first electronic component do not necessarily have to be held completely. This is because even if the holding is such that they can move relatively slightly, on the contrary, the slight movement can be expected to have a damping effect against excess vibration.
　また上記構成によれば、振動吸収材などの部材を追加することなくセンサの出力を安定させることができるため、経済的にも有利である。 Further, according to the above configuration, since the output of the sensor can be stabilized without adding a member such as a vibration absorbing material, it is economically advantageous.
　本発明による車両安全装置制御ユニットは、筐体の天面に取り付けられリード線を有する第２の電子部品をさらに備え、第１の電子部品の上端には、第２の電子部品のリード線に電気的に接続し、筐体の天面から突出する保持部に保持される端子が形成されているとよい。 The vehicle safety device control unit according to the present invention further includes a second electronic component attached to the top surface of the housing and having a lead wire, and the upper end of the first electronic component is connected to the lead wire of the second electronic component. A terminal that is electrically connected and is held by a holding portion protruding from the top surface of the housing may be formed.
　上記構成によれば、第１の電子部品は、回路基板のスペースが足りないなど、何らかの事情で筐体の天面に取り付けられた第２電子部品を回路基板に電気的に接続させる役割を果たす。言い換えれば、回路を立体的に構成したときに回路基板と筐体との間を橋渡しする第１の電子部品を利用して、その近傍にセンサを配置することにより、センサの出力を安定させることができる。 According to the above configuration, the first electronic component plays a role in electrically connecting the second electronic component attached to the top surface of the housing for some reason, such as a lack of space on the circuit board. . In other words, by using the first electronic component that bridges between the circuit board and the housing when the circuit is configured in three dimensions, the sensor is placed in the vicinity to stabilize the output of the sensor. Can do.
　上記の第２の電子部品はコンデンサとしてよく、上記のセンサは加速度センサとしてよい。 The second electronic component may be a capacitor, and the sensor may be an acceleration sensor.
　本発明によれば、車両の振動による悪影響を受けにくく安定した出力が可能なセンサを搭載した車両安全装置制御ユニットを提供することができる。 According to the present invention, it is possible to provide a vehicle safety device control unit equipped with a sensor that is less susceptible to the adverse effects of vehicle vibrations and that can output stably.
本発明にかかる車両安全装置制御ユニットの実施形態であるＥＣＵの車両における配置を例示する図である。It is a figure which illustrates arrangement | positioning in the vehicle of ECU which is embodiment of the vehicle safety device control unit concerning this invention. 図１のＥＣＵの組立図である。It is an assembly drawing of ECU of FIG. 図２のＥＣＵの完成図である。FIG. 3 is a completed view of the ECU of FIG. 2. 図２の回路基板および筐体の斜視図である。FIG. 3 is a perspective view of a circuit board and a housing of FIG. 2. 図３のＡ－Ａ断面を例示する斜視図である。FIG. 4 is a perspective view illustrating an AA cross section of FIG. 3. 図４のドミノが筐体に保持されている様子を例示する斜視図である。FIG. 5 is a perspective view illustrating a state in which the domino of FIG. 4 is held in a housing. 図４の回路基板の拡大図である。It is an enlarged view of the circuit board of FIG. 図７の回路基板の平面図である。It is a top view of the circuit board of FIG. 図４の回路基板の側面図である。It is a side view of the circuit board of FIG. 図９の回路基板の平面図である。FIG. 10 is a plan view of the circuit board of FIG. 9. 図４の回路基板に別の加速度センサを追加したＥＣＵの平面図である。It is a top view of ECU which added another acceleration sensor to the circuit board of FIG. 図１１の２つの加速度センサの周波数応答シミュレーション解析結果であり、Ｘ軸方向の入力に対する各センサ搭載位置のＸ／Ｙ／Ｚ軸方向の揺れを出力として示すグラフである。FIG. 12 is a graph showing the frequency response simulation analysis results of the two acceleration sensors in FIG. 11, and showing the X / Y / Z-axis direction fluctuation of each sensor mounting position with respect to the input in the X-axis direction as an output. 図１１の２つの加速度センサの周波数応答シミュレーション解析結果であり、Ｙ軸方向の入力に対する各センサ搭載位置のＸ／Ｙ／Ｚ軸方向の揺れを出力として示すグラフである。FIG. 12 is a graph showing the frequency response simulation analysis results of the two acceleration sensors in FIG. 11, and showing the X / Y / Z-axis direction fluctuations of the respective sensor mounting positions with respect to the input in the Y-axis direction as outputs. FIG. 図１１の２つの加速度センサの周波数応答シミュレーション解析結果であり、Ｚ軸方向の入力に対する各センサ搭載位置のＸ／Ｙ／Ｚ軸方向の揺れを出力として示すグラフである。FIG. 12 is a graph showing the results of frequency response simulation analysis of the two acceleration sensors in FIG. 11, and showing the X / Y / Z-axis direction fluctuations of the sensor mounting positions with respect to the input in the Z-axis direction as outputs. FIG.
１００  …エアバッグ
１０１  …車両
１０２Ａ、１０２Ｂ  …プリテンショナ
１０４  …ステアリングホイール
１０７  …助手席エアバッグ
１０８Ａ、１０８Ｂ  …カーテンエアバッグ
１１４、２１４  …ＥＣＵ
１１６  …回路基板
１２０  …筐体
１２４  …カバー
１３０Ａ、１３０Ｂ、１３０Ｃ、１３０Ｄ  …ネジ
１３２、１３４、１３６  …側壁
１３８  …コネクタ
１４０、１４２  …フランジ
１５０、１５１  …加速度センサ
１５２  …天面
１５４  …ドミノ
１５６、１５８  …端子
１６０、１６２  …リード線
１６３、１６５  …保持部
１６４  …コンデンサ
１６６、１８６  …頂点
１７０  …三角錐
１７２、１７４、１７６  …角部
１９０  …円錐 DESCRIPTION OF SYMBOLS 100 ... Airbag 101 ... Vehicle 102A, 102B ... Pretensioner 104 ... Steering wheel 107 ... Passenger seat airbag 108A, 108B ... Curtain airbag 114, 214 ... ECU
116 ... Circuit board 120 ... Housing 124 ... Covers 130A, 130B, 130C, 130D ... Screws 132, 134, 136 ... Side walls 138 ... Connectors 140, 142 ... Flange 150, 151 ... Acceleration sensor 152 ... Top surface 154 ... Domino 156, 158 ... Terminals 160 and 162 ... Lead wires 163 and 165 ... Holding part 164 ... Capacitors 166 and 186 ... Apex 170 ... Triangular pyramids 172, 174 and 176 ... Corner parts 190 ... Cones
　以下に添付図面を参照しながら、本発明の好適な実施形態について詳細に説明する。かかる実施形態に示す寸法、材料、その他具体的な数値などは、発明の理解を容易とするための例示に過ぎず、特に断る場合を除き、本発明を限定するものではない。なお、本明細書及び図面において、実質的に同一の機能、構成を有する要素については、同一の符号を付することにより重複説明を省略し、また本発明に直接関係のない要素は図示を省略する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.
　図１は、本発明にかかる車両安全装置制御ユニットの実施形態であるＥＣＵ（Electronic Control Unit）１１４の車両１０１における配置を例示する図である。図１に例示するように、車両１０１は、安全装置として、エアバッグ１００およびシートベルトプリテンショナ（以下、プリテンショナ１０２Ａ・１０２Ｂ）を備えている。 FIG. 1 is a diagram exemplifying an arrangement in a vehicle 101 of an ECU (Electronic Control Unit) 114 that is an embodiment of a vehicle safety device control unit according to the present invention. As illustrated in FIG. 1, the vehicle 101 includes an airbag 100 and a seat belt pretensioner (hereinafter, pretensioners 102A and 102B) as safety devices.
　エアバッグ１００は、ステアリングホイール１０４に設置されたフロントエアバッグ１０６、前部左座席に設けられた助手席エアバッグ１０７、および車室側部に設置されたカーテンエアバッグ１０８Ａ・１０８Ｂを含んでいる。エアバッグ１００およびプリテンショナ１０２Ａ・１０２Ｂは、ＥＣＵ１１４によって制御される。より具体的には、ＥＣＵ１１４に搭載された加速度センサ１５０や、特に図示していないが、ヨーレートセンサ、ロールオーバセンサなどによる衝撃の検知に起因して作動する。特に、フロントエアバッグ１０６は多段階制御が可能になっていて、車両１０１に生じた加速度の度合いすなわち衝撃の度合いに応じて膨張展開の度合いを制御することができる。 The airbag 100 includes a front airbag 106 installed on the steering wheel 104, a passenger airbag 107 installed on the front left seat, and curtain airbags 108A and 108B installed on the side of the passenger compartment. . The airbag 100 and the pretensioners 102A and 102B are controlled by the ECU 114. More specifically, it operates due to the detection of an impact by an acceleration sensor 150 mounted on the ECU 114, or a yaw rate sensor, a rollover sensor, or the like (not shown). In particular, the front airbag 106 can be controlled in multiple stages, and the degree of inflation and deployment can be controlled in accordance with the degree of acceleration generated in the vehicle 101, that is, the degree of impact.
　図２は図１のＥＣＵ１１４の組立図である。ＥＣＵ１１４は、回路基板１１６と、回路基板１１６の表面１１８（図２では基板１１６の下側）を被覆する樹脂製の筐体１２０と、回路基板１１６の裏面１２２に固定される金属製のカバー１２４とを備える。筐体１２０の回路基板１１６側は開口している。カバー１２４、回路基板１１６および筐体１２０は、固定具としてのネジ１３０Ａ、１３０Ｂ、１３０Ｃ、１３０Ｄによって固定される。これにより、回路基板１１６の周縁が筐体１２０の周縁部の側壁１３２、１３４、１３６に固定される。 FIG. 2 is an assembly diagram of the ECU 114 of FIG. The ECU 114 includes a circuit board 116, a resin casing 120 that covers the surface 118 of the circuit board 116 (the lower side of the board 116 in FIG. 2), and a metal cover 124 that is fixed to the back surface 122 of the circuit board 116. With. The circuit board 116 side of the housing 120 is open. The cover 124, the circuit board 116, and the housing 120 are fixed by screws 130A, 130B, 130C, and 130D as fixing tools. As a result, the peripheral edge of the circuit board 116 is fixed to the side walls 132, 134, and 136 of the peripheral edge portion of the housing 120.
　図３は図２のＥＣＵ１１４の完成図である。図３は図２のＥＣＵ１１４を上下逆にした状態を例示している。図３では、筐体１２０に被覆された回路基板１１６の表面１１８は見えていず、回路基板１１６に設けられたコネクタ１３８だけが筐体１２０の端部から露出している。カバー１２４もほとんど見えていず、カバー１２４の両側に設けられたフランジ１４０、１４２だけが露出している。ＥＣＵ１１４はフランジ１４０、１４２に設けられた孔１４４、１４６、１４８を介してネジ等（図示しない）によって車体に締結される。 FIG. 3 is a completed view of the ECU 114 of FIG. FIG. 3 illustrates a state where the ECU 114 of FIG. 2 is turned upside down. In FIG. 3, the surface 118 of the circuit board 116 covered with the housing 120 is not visible, and only the connector 138 provided on the circuit board 116 is exposed from the end of the housing 120. The cover 124 is hardly visible, and only the flanges 140 and 142 provided on both sides of the cover 124 are exposed. The ECU 114 is fastened to the vehicle body by screws or the like (not shown) through holes 144, 146, 148 provided in the flanges 140, 142.
　図４は図２の回路基板１１６および筐体１２０の斜視図である。図４では、図示の便宜上、回路基板１１６を図２に例示したのと上下逆にし、表面１１８が上を向いた状態を例示している。図４に例示するように、ＥＣＵ１１４は、回路基板１１６の表面１１８に搭載された加速度センサ１５０を備える。なお加速度センサ１５０は回路基板１１６の裏面１２２に搭載してもよい。 4 is a perspective view of the circuit board 116 and the housing 120 of FIG. For convenience of illustration, FIG. 4 illustrates a state in which the circuit board 116 is turned upside down as illustrated in FIG. 2 and the surface 118 faces upward. As illustrated in FIG. 4, the ECU 114 includes an acceleration sensor 150 mounted on the surface 118 of the circuit board 116. The acceleration sensor 150 may be mounted on the back surface 122 of the circuit board 116.
　図５は図３のＡ－Ａ断面を例示する斜視図である。ＥＣＵ１１４は様々な電子部品を備えているが、本願の各図面では本発明に直接関係のある電子部品だけを例示し、その他のものは図示省略している。ＥＣＵ１１４は第１の電子部品としてドミノ１５４を備えている。ドミノ１５４は、第２の電子部品として筐体１２０の天面１５２に配置されたコンデンサ１６４を回路基板１１６と電気的に接続させる端子の一種である。ドミノ１５４は、図４に例示したように回路基板１１６の表面１１８に搭載されている。そしてドミノ１５４は、図５に例示するように、ＥＣＵ１１４が組み立てられた状態において、筐体１２０の天面１５２から突出する保持部１６３、１６５まで延び、天面１５２に保持されている。 FIG. 5 is a perspective view illustrating an AA cross section of FIG. The ECU 114 includes various electronic components, but in the drawings of the present application, only the electronic components directly related to the present invention are illustrated, and the other components are not shown. The ECU 114 includes a domino 154 as a first electronic component. The domino 154 is a type of terminal that electrically connects the capacitor 164 disposed on the top surface 152 of the housing 120 as the second electronic component to the circuit board 116. The domino 154 is mounted on the surface 118 of the circuit board 116 as illustrated in FIG. As illustrated in FIG. 5, the domino 154 extends to the holding portions 163 and 165 protruding from the top surface 152 of the housing 120 and is held on the top surface 152 in a state where the ECU 114 is assembled.
　より詳細に説明すれば、ドミノ１５４の上端には２つの二股の端子１５６、１５８が形成されていて、ドミノ１５４のうち、これら端子１５６、１５８の先端が筐体１２０の天面１５２に最も近い。一方、筐体１２０の天面１５２には、リード線１６０、１６２を有するコンデンサ１６４が取り付けられている。図５に例示するように、ドミノ１５４の上端の端子１５６、１５８は、コンデンサ１６４のリード線１６０、１６２を挟むように電気的に接続し、天面１５２から突出する保持部１６３、１６５に挿入される。これにより、コンデンサ１６４のリード線１６０、１６２が筐体１２０に保持されている。なお図５では端子１５６、１５８および保持部１６３、１６５は一部遮られて見えていない。 More specifically, two forked terminals 156 and 158 are formed at the upper end of the domino 154, and the ends of the terminals 156 and 158 of the domino 154 are closest to the top surface 152 of the housing 120. . On the other hand, a capacitor 164 having lead wires 160 and 162 is attached to the top surface 152 of the housing 120. As illustrated in FIG. 5, the terminals 156 and 158 at the upper end of the domino 154 are electrically connected so as to sandwich the lead wires 160 and 162 of the capacitor 164 and inserted into the holding portions 163 and 165 protruding from the top surface 152. Is done. As a result, the lead wires 160 and 162 of the capacitor 164 are held in the housing 120. In FIG. 5, the terminals 156 and 158 and the holding portions 163 and 165 are partially obstructed and cannot be seen.
　図６は図５の部分拡大図であり、ドミノ１５４が筐体１２０に保持されている様子を例示する図である。ドミノ１５４を介した回路基板１１６を筐体１２０に保持する手順は以下の通りである。まずコンデンサ１６４を筐体１２０に組み込んだ後、ドミノ１５４を搭載した回路基板１１６を筐体１２０に挿入する。その過程でドミノ１５４の上端の端子１５６、１５８をコンデンサ１６４のリード線１６０、１６２に噛みこませ、さらにドミノ１５４を筐体１２０の天面１５０に向かって押し込む。これによって、コンデンサ１６４のリード線１６０、１６２を筐体１２０の保持部１６３、１６５が形成しているスリット１６７、１６９の最奥まで押し付ける。その結果、ＥＣＵ１１４の上下方向に、筐体１２０・コンデンサ１６４のリード線１６０、１６２・ドミノ１５４・回路基板１１６が相互に押し合う構造になっている。これによって、ドミノ１５４を介して回路基板１１６が筐体１２０に保持される。 FIG. 6 is a partially enlarged view of FIG. 5, illustrating a state in which the domino 154 is held in the housing 120. The procedure for holding the circuit board 116 in the housing 120 via the domino 154 is as follows. First, after the capacitor 164 is incorporated into the housing 120, the circuit board 116 on which the domino 154 is mounted is inserted into the housing 120. In this process, the terminals 156 and 158 at the upper end of the domino 154 are engaged with the lead wires 160 and 162 of the capacitor 164, and the domino 154 is pushed toward the top surface 150 of the housing 120. As a result, the lead wires 160 and 162 of the capacitor 164 are pressed to the innermost part of the slits 167 and 169 formed by the holding portions 163 and 165 of the housing 120. As a result, the casing 120, the lead wires 160 and 162 of the capacitor 164, the domino 154, and the circuit board 116 are pressed against each other in the vertical direction of the ECU 114. As a result, the circuit board 116 is held on the housing 120 via the domino 154.
　なおドミノ１５４およびその二股の端子１５６、１５８の形状は一例にすぎず、筐体１２０天面１５２側に保持されるものであれば、いかなる形状を有していてもよい。 Note that the shapes of the domino 154 and its bifurcated terminals 156, 158 are merely examples, and may have any shape as long as they are held on the casing 120 top surface 152 side.
（第１の実施形態）
　図７は図４の回路基板１１６の拡大図であり、本発明の第１の実施形態を例示する図である。図７に例示するように、加速度センサ１５０は、図４および図５に例示した筐体１２０の天面１５２の保持部１６３、１６５にドミノ１５４が保持された位置（本実施形態では端子１５６の先端）を頂点１６６とする三角錐１７０の内部空間に配置されている。この「配置されている」とは、三角錐１７０の内部空間に加速度センサ１５０の全体あるいは大部分が包含されていることが望ましいが、加速度センサ１５０の一部が三角錐１７０の内部空間に包含されている状態も含む。 (First embodiment)
FIG. 7 is an enlarged view of the circuit board 116 of FIG. 4, and is a diagram illustrating the first embodiment of the present invention. As illustrated in FIG. 7, the acceleration sensor 150 includes a position where the domino 154 is held by the holding portions 163 and 165 of the top surface 152 of the casing 120 illustrated in FIGS. 4 and 5 (in this embodiment, the terminal 156 It is arranged in the internal space of the triangular pyramid 170 having the apex 166 as a vertex. This “arranged” means that the whole or most of the acceleration sensor 150 is preferably included in the internal space of the triangular pyramid 170, but a part of the acceleration sensor 150 is included in the internal space of the triangular pyramid 170. Including the state that has been.
　三角錐１７０は、三角錐１７０の頂点１６６に最も近い２つのネジ１３０Ａ、１３０Ｂ（図７では図示省略）の位置に角部１７２、１７４を形成する三角形を底面とする三角錐である。三角錐１７０の内部空間は、回路基板１１６と筐体１２０との間に追加された保持点（端子１５６の先端）すなわち三角錐１７０の頂点１６６の近傍に形成されることが望ましい。また、本実施形態では、２つの端子１５６、１５８のうち、２つのネジ１３０Ａ、１３０Ｂからより遠い端子１５６の先端を頂点１６６とする三角錐１７０を想定している。かかる三角錐１７０は、２つのネジ１３０Ａ、１３０Ｂからより近い端子１５８による制振効果も見込め、内部空間も広くなる。ただし、例えば端子１５８の先端を頂点とする三角錐としてもよい。 The triangular pyramid 170 is a triangular pyramid whose bottom surface is a triangle that forms corners 172 and 174 at the positions of two screws 130A and 130B (not shown in FIG. 7) that are closest to the apex 166 of the triangular pyramid 170. The internal space of the triangular pyramid 170 is preferably formed in the vicinity of the holding point (the tip of the terminal 156) added between the circuit board 116 and the housing 120, that is, the apex 166 of the triangular pyramid 170. In the present embodiment, a triangular pyramid 170 is assumed in which the tip of the terminal 156 farther from the two screws 130A and 130B out of the two terminals 156 and 158 is the vertex 166. Such a triangular pyramid 170 can also be expected to have a vibration damping effect by the terminal 158 closer to the two screws 130A and 130B, and the internal space is also widened. However, for example, a triangular pyramid with the tip of the terminal 158 as a vertex may be used.
　図８は図７の回路基板１１６の平面図である。三角錐１７０の底面である三角形は、頂点１６６から回路基板１１６に向かう垂線１８０（図７）の、回路基板１１６の表面１１８との交点を角部１７６としている。したがって図８に例示するように回路基板１１６を真上から見ると、三角錐１７０の頂点１６６と底面である三角形の角部１７６とは、重なって見え、このとき角部１７６と角部１７２、１７４とで形成される三角形が、三角錐１７０の底面となる。 FIG. 8 is a plan view of the circuit board 116 of FIG. The triangle which is the bottom surface of the triangular pyramid 170 has a corner 176 at the intersection of the perpendicular 180 (FIG. 7) from the vertex 166 to the circuit board 116 and the surface 118 of the circuit board 116. Accordingly, when the circuit board 116 is viewed from directly above as illustrated in FIG. 8, the apex 166 of the triangular pyramid 170 and the triangular corner 176 which is the bottom surface appear to overlap, and at this time, the corner 176 and the corner 172, A triangle formed by 174 is the bottom surface of the triangular pyramid 170.
　以上のように、本実施形態によれば、回路基板１１６は、図２や図４に例示したようにネジ１３０Ａ、１３０Ｂ、１３０Ｃ、１３０Ｄによって回路基板１１６の表面１１８という平面上で筐体１２０に固定されるだけではない。すなわち図５に例示したように、回路基板１１６は、ドミノ１５４を介してさらに、筐体１２０の天面１５２方向の立体的な位置という、回路基板１１６の表面１１８から上方に離れた位置（図７の三角錐１７０の頂点１６６等）においても筐体１２０に保持される。かかる保持点の追加によって回路基板１１６の筐体１２０に対する固定は立体的に構築されることとなる。 As described above, according to the present embodiment, the circuit board 116 is attached to the casing 120 on the plane of the surface 118 of the circuit board 116 by the screws 130A, 130B, 130C, and 130D as illustrated in FIGS. It is not only fixed. That is, as illustrated in FIG. 5, the circuit board 116 is further spaced apart from the front surface 118 of the circuit board 116 by a three-dimensional position in the direction of the top surface 152 of the housing 120 via the domino 154 (see FIG. 5). 7 at the apex 166 of the triangular pyramid 170, etc.). By adding such a holding point, the fixing of the circuit board 116 to the housing 120 is three-dimensionally constructed.
　とりわけ、三角錐１７０の内部空間は、回路基板１１６と筐体１２０との間に立体的に点在する保持点（頂点１６６、角部１７２、１７４）で囲まれているため、堅固な構造を有する。保持点には制振効果が見込まれ、また、かかる三角錐１７０の内部空間に加速度センサ１５０が配置されているため、加速度センサ１５０は車両の振動による悪影響を受けにくく、安定した出力が可能となる。 In particular, the internal space of the triangular pyramid 170 is surrounded by holding points (vertex 166, corner portions 172, 174) that are three-dimensionally scattered between the circuit board 116 and the housing 120, so that a solid structure can be obtained. Have. The holding point is expected to have a damping effect, and the acceleration sensor 150 is disposed in the internal space of the triangular pyramid 170, so that the acceleration sensor 150 is not easily affected by the vibration of the vehicle and can output stably. Become.
　なお、筐体１２０の天面１５２に設けられた保持部１６３、１６５とドミノ１５４とは、必ずしも完全に保持（固定）されていなくてもよい。それらが相対的にわずかに動くことができるような保持であっても、逆に、そのわずかな動きによって余分な振動に対する制振効果が見込めるからである。 Note that the holding portions 163 and 165 and the domino 154 provided on the top surface 152 of the housing 120 are not necessarily held (fixed) completely. This is because even if the holding is such that they can move relatively slightly, on the contrary, the slight movement can be expected to have a damping effect against excess vibration.
　また本実施形態によれば、振動吸収材などの部材を追加することなく加速度センサ１５０の出力を安定させることができるため、経済的にも有利である。 Further, according to the present embodiment, the output of the acceleration sensor 150 can be stabilized without adding a member such as a vibration absorbing material, which is economically advantageous.
　さらに、三角錐１７０は、ネジ１３０Ａ、１３０Ｂの位置を底面（三角形）の角部とすることで堅固な構造となっているが、底面の残りの１つの角部１７６も、回路基板１１６の表面１１８における、三角錐１７０の頂点１６６から最も近い点である。したがって、三角錐１７０の内部空間はその頂点１６６の近傍に形成されている。 Further, the triangular pyramid 170 has a solid structure by setting the positions of the screws 130A and 130B to the corners of the bottom surface (triangle), but the remaining one corner 176 of the bottom surface is also formed on the surface of the circuit board 116. The point closest to the apex 166 of the triangular pyramid 170 at 118. Therefore, the internal space of the triangular pyramid 170 is formed in the vicinity of the vertex 166.
（第２の実施形態）
　図９は図４の回路基板１１６の側面図であり、本発明の第２の実施形態を例示する図である。図９に例示するように、加速度センサ１５０は、図４および図５に例示した筐体１２０の天面１５２の、ドミノ１５４が保持された位置（本実施形態では端子１５６・１５８の先端のちょうど中間）を頂点１８６とする円錐１９０の内部空間に配置されている。この「配置されている」とは、円錐１９０の内部空間に加速度センサ１５０の全体あるいは大部分が包含されていることが望ましいが、加速度センサ１５０の一部が円錐１９０の内部空間に包含されている状態も含む。 (Second Embodiment)
FIG. 9 is a side view of the circuit board 116 of FIG. 4, and is a diagram illustrating a second embodiment of the present invention. As illustrated in FIG. 9, the acceleration sensor 150 includes the position where the domino 154 is held on the top surface 152 of the housing 120 illustrated in FIGS. 4 and 5 (in the present embodiment, just the tips of the terminals 156 and 158). It is arranged in the internal space of the cone 190 with the middle point as the vertex 186. This “arranged” means that the whole or most of the acceleration sensor 150 is preferably included in the internal space of the cone 190, but a part of the acceleration sensor 150 is included in the internal space of the cone 190. Including the state.
　図１０は図９の回路基板１１６の平面図である。上記の円錐１９０は、円錐１９０の頂点１８６に最も近い２つのネジ１３０Ａ、１３０Ｂを内包する円を底面とする円錐である。円錐１９０の内部空間は、回路基板１１６と筐体１２０との間に立体的に追加された保持点（端子１５６・１５８の先端のちょうど中間）すなわち円錐１９０の頂点１８６の近傍に形成されることが望ましい。また、本実施形態では端子１５６・１５８の先端のちょうど中間を頂点１８６とする円錐１９０を想定しているが、例えば端子１５６または１５８の先端を頂点とする円錐としてもよい。 FIG. 10 is a plan view of the circuit board 116 of FIG. The cone 190 is a cone whose bottom surface is a circle containing the two screws 130 </ b> A and 130 </ b> B closest to the apex 186 of the cone 190. The internal space of the cone 190 is formed in the vicinity of the holding point (three-dimensionally added between the tips of the terminals 156 and 158) added between the circuit board 116 and the housing 120, that is, in the vicinity of the apex 186 of the cone 190. Is desirable. In this embodiment, a cone 190 having a vertex 186 at the very middle of the ends of the terminals 156 and 158 is assumed. However, for example, a cone having the tip of the terminal 156 or 158 as a vertex may be used.
　図９に例示するように、円錐１９０の底面である円は、頂点１８６から回路基板１１６に向かう垂線２００の、回路基板１１６の表面１１８との交点を中心２０２とし、頂点１８６から交点までの距離Ｈに等しい半径Ｈを有する。したがって図１０に例示するように回路基板１１６を真上から見ると、円錐１９０の頂点１８６と底面である円の中心２０２とは、重なって見える。 As illustrated in FIG. 9, the circle which is the bottom surface of the cone 190 is centered at the intersection point of the perpendicular line 200 from the vertex 186 to the circuit board 116 with the surface 118 of the circuit board 116, and the distance from the vertex 186 to the intersection point. It has a radius H equal to H. Accordingly, when the circuit board 116 is viewed from directly above as illustrated in FIG. 10, the apex 186 of the cone 190 and the center 202 of the circle that is the bottom surface appear to overlap.
　以上のように、本実施形態によれば、回路基板１１６は、図２や図４に例示したようにネジ１３０Ａ、１３０Ｂ、１３０Ｃ、１３０Ｄによって回路基板１１６の表面１１８という平面上で筐体１２０に固定されるだけではない。すなわち図５に例示したように、回路基板１１６は、ドミノ１５４を介してさらに、筐体１２０の天面１５２という回路基板１１６の表面１１８から上方に離れた位置（図７の三角錐１７０の頂点１６６等）においても筐体１２０に保持される。かかる保持点の追加によって回路基板１１６の筐体１２０に対する固定は立体的に構築されることとなる。 As described above, according to the present embodiment, the circuit board 116 is attached to the casing 120 on the plane of the surface 118 of the circuit board 116 by the screws 130A, 130B, 130C, and 130D as illustrated in FIGS. It is not only fixed. That is, as illustrated in FIG. 5, the circuit board 116 is further spaced apart from the surface 118 of the circuit board 116, which is the top surface 152 of the housing 120, via the domino 154 (the apex of the triangular pyramid 170 in FIG. 7. 166) and the like are also held by the housing 120. By adding such a holding point, the fixing of the circuit board 116 to the housing 120 is three-dimensionally constructed.
　とりわけ、円錐１９０の内部空間は、回路基板１１６と筐体１２０との間に立体的に点在する保持点（頂点１８６、ネジ１３０Ａ、１３０Ｂ）で囲まれているため、堅固な構造を有する。保持点には制振効果が見込まれ、また、かかる円錐１９０の内部空間に加速度センサ１５０が配置されているため、加速度センサ１５０は車両の振動による悪影響を受けにくく、安定した出力が可能となる。 In particular, the inner space of the cone 190 is surrounded by holding points (vertex 186, screws 130A, 130B) three-dimensionally scattered between the circuit board 116 and the housing 120, and thus has a solid structure. A vibration damping effect is expected at the holding point, and since the acceleration sensor 150 is disposed in the inner space of the cone 190, the acceleration sensor 150 is not easily affected by the vibration of the vehicle and can output stably. .
　また本実施形態によれば、振動吸収材などの部材を追加することなく加速度センサ１５０の出力を安定させることができるため、経済的にも有利である。 Further, according to the present embodiment, the output of the acceleration sensor 150 can be stabilized without adding a member such as a vibration absorbing material, which is economically advantageous.
　さらに、円錐１９０は、その底面がネジ１３０Ａ、１３０Ｂを内包することで堅固な構造となっているが、底面の中心２０２も、回路基板１１６の表面１１８における、円錐１９０の頂点１８６から最も近い点である。そして底面である円の半径は、円錐１９０の高さＨに等しい。したがって、円錐１９０の内部空間はその頂点１８６の近傍に形成されている。 Further, the cone 190 has a rigid structure with the bottom surface containing the screws 130 </ b> A and 130 </ b> B. The center 202 of the bottom surface is also a point closest to the apex 186 of the cone 190 on the surface 118 of the circuit board 116. It is. The radius of the circle that is the bottom surface is equal to the height H of the cone 190. Therefore, the internal space of the cone 190 is formed in the vicinity of the vertex 186.
（ドミノ）
　第１および第２の実施形態によれば、ドミノ１５４は、回路基板１１６のスペースが足りないなど、何らかの事情で筐体１２０の天面１５２に取り付けられたコンデンサ１６４を回路基板１１６に電気的に接続させる役割を果たす。言い換えれば、回路を立体的に構成したときに回路基板１１６と筐体１２０との間を橋渡しするドミノ１５４を利用して、その近傍に加速度センサ１５０を配置することにより、加速度センサ１５０の出力を安定させることができる。 (Domino)
According to the first and second embodiments, the domino 154 electrically connects the capacitor 164 attached to the top surface 152 of the housing 120 to the circuit board 116 for some reason, such as when the space of the circuit board 116 is insufficient. Play the role of connecting. In other words, by using the domino 154 that bridges between the circuit board 116 and the housing 120 when the circuit is three-dimensionally configured, the acceleration sensor 150 is disposed in the vicinity thereof, and thereby the output of the acceleration sensor 150 is obtained. It can be stabilized.
（周波数応答シミュレーション解析）
　図１１は図４の回路基板１１６に別の加速度センサ１５１を追加したＥＣＵ２１４の平面図である。図１１（ａ）は筐体１２０が回路基板１１６の表面１１８を被覆した状態であり、図１１（ｂ）は回路基板１１６から筐体１２０を除去した状態である。図１１（ｂ）に例示するように、ＥＣＵ２１４には、加速度センサ１５０だけでなく、別の加速度センサ１５１が搭載されている。加速度センサ１５１は、加速度センサ１５０と異なり、第１および第２の実施形態でそれぞれ例示した三角錐１７０または円錐１９０の内部空間には配置されていない。 (Frequency response simulation analysis)
FIG. 11 is a plan view of the ECU 214 in which another acceleration sensor 151 is added to the circuit board 116 of FIG. FIG. 11A shows a state where the housing 120 covers the surface 118 of the circuit board 116, and FIG. 11B shows a state where the housing 120 is removed from the circuit board 116. As illustrated in FIG. 11B, not only the acceleration sensor 150 but also another acceleration sensor 151 is mounted on the ECU 214. Unlike the acceleration sensor 150, the acceleration sensor 151 is not arranged in the internal space of the triangular pyramid 170 or the cone 190 exemplified in the first and second embodiments, respectively.
　図１２ないし図１４は、図１１の２つの加速度センサの周波数応答シミュレーション解析結果である。図１２はＥＣＵ２１４へのＸ軸方向の入力に対する加速度センサ１５０、１５１それぞれの搭載位置のＸ／Ｙ／Ｚ軸方向の揺れを出力として示すグラフである。なおＺ軸方向は、図１１の紙面に直交する方向である。図１３はＥＣＵ２１４へのＹ軸方向の入力に対する加速度センサ１５０、１５１それぞれの搭載位置のＸ／Ｙ／Ｚ軸方向の揺れを出力として示すグラフである。図１４はＥＣＵ２１４へのＺ軸方向の入力に対する加速度センサ１５０、１５１それぞれの搭載位置のＸ／Ｙ／Ｚ軸方向の揺れを出力として示すグラフである。図１２ないし図１４において、縦軸は加速度出力、横軸は周波数を示している。 FIGS. 12 to 14 show frequency response simulation analysis results of the two acceleration sensors shown in FIG. FIG. 12 is a graph showing, as an output, fluctuations in the X / Y / Z-axis direction of the mounting positions of the acceleration sensors 150 and 151 with respect to the input in the X-axis direction to the ECU 214. The Z-axis direction is a direction orthogonal to the paper surface of FIG. FIG. 13 is a graph showing, as an output, fluctuations in the X / Y / Z axis directions of the mounting positions of the acceleration sensors 150 and 151 with respect to the input in the Y axis direction to the ECU 214. FIG. 14 is a graph showing, as an output, fluctuations in the X / Y / Z-axis direction of the mounting positions of the acceleration sensors 150 and 151 with respect to the input to the ECU 214 in the Z-axis direction. 12 to 14, the vertical axis represents acceleration output, and the horizontal axis represents frequency.
　図１２（ａ）、図１３（ａ）および図１４（ａ）にそれぞれ例示する通り、Ｘ／Ｙ／Ｚ軸方向の入力に対するＸ軸方向の揺れは、加速度センサ１５０、１５１のいずれも、ほとんど差がない。一方、図１２（ｂ）（ｃ）、図１３（ｂ）（ｃ）および図１４（ｂ）（ｃ）にそれぞれ例示する通り、Ｘ／Ｙ／Ｚ軸方向の入力に対するＹ／Ｚ軸方向の揺れは、ほとんどの周波数領域において、加速度センサ１５０のほうが加速度センサ１５１より低い値を示している。 As illustrated in FIG. 12A, FIG. 13A, and FIG. 14A, respectively, the fluctuation in the X-axis direction with respect to the input in the X / Y / Z-axis direction is almost the same in both the acceleration sensors 150 and 151. There is no difference. On the other hand, as illustrated in FIGS. 12 (b) (c), 13 (b) (c) and 14 (b) (c), respectively, the input in the Y / Z axis direction with respect to the input in the X / Y / Z axis direction is illustrated. As for the vibration, the acceleration sensor 150 shows a lower value than the acceleration sensor 151 in most frequency regions.
　以上の周波数応答解析の結果より、本発明の第１および第２の実施形態で例示した三角錐１７０または円錐１９０の内部空間に配置された加速度センサ１５０の出力のほうが、内部空間の外に配置された加速度センサ１５１の出力よりも、振動による影響を受け難いことがわかる。 From the result of the frequency response analysis described above, the output of the acceleration sensor 150 arranged in the internal space of the triangular pyramid 170 or the cone 190 exemplified in the first and second embodiments of the present invention is arranged outside the internal space. It can be seen that the output of the acceleration sensor 151 is less susceptible to vibration.
　以上、添付図面を参照しながら本発明の好適な実施形態について説明したが、本発明は係る例に限定されないことは言うまでもない。当業者であれば、特許請求の範囲に記載された範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。 The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.
　本発明は、車両衝突時に車両に生じた加速度を検出する加速度センサ等を搭載し、車両用安全装置を制御する車両安全装置制御ユニットに利用することができる。 The present invention can be used in a vehicle safety device control unit that controls a vehicle safety device by mounting an acceleration sensor or the like that detects acceleration generated in the vehicle at the time of a vehicle collision.

Claims (8)

  1. 　車両用安全装置を制御する車両安全装置制御ユニットにおいて、
    　回路基板と、
    　前記回路基板の表面または裏面に搭載されたセンサと、
    　前記回路基板を被覆する筐体と、
    　前記回路基板の周縁を前記筐体の周縁部に固定する複数の固定具と、
    　前記回路基板の表面に搭載され前記筐体の天面方向に延び該天面から突出する保持部に保持される第１の電子部品とを備え、
    　第１の電子部品の前記筐体の天面に最も近い上端部を頂点とする三角錐であって、該頂点から前記回路基板に向かう垂線の該回路基板の表面との交点の角部と、前記複数の固定具のうち２つの固定具の位置の２つの角部から構成される三角形を底面とする三角錐の内部空間に前記センサが配置されていることを特徴とする車両安全装置制御ユニット。     In a vehicle safety device control unit for controlling a vehicle safety device,
    A circuit board;
    A sensor mounted on the front or back surface of the circuit board;
    A housing covering the circuit board;
    A plurality of fixtures for fixing the periphery of the circuit board to the periphery of the housing;
    A first electronic component mounted on the surface of the circuit board and held in a holding portion that extends in the top surface direction of the housing and protrudes from the top surface;
    A triangular pyramid having an upper end closest to the top surface of the housing of the first electronic component as a vertex, and a corner of an intersection of a perpendicular line from the vertex to the surface of the circuit board; The vehicle safety device control unit, characterized in that the sensor is arranged in an internal space of a triangular pyramid having a triangle formed from two corners at positions of two fixtures among the plurality of fixtures. .
  2. 　第１の電子部品は、前記筐体の天面に最も近い上端部を２つ有し、前記三角錐は、前記２つの上端部のうち、前記２つの固定具からより遠い上端部を前記頂点とすることを特徴とする請求項１に記載の車両安全装置制御ユニット。 The first electronic component has two upper end portions closest to the top surface of the housing, and the triangular pyramid has an upper end portion farther from the two fixtures of the two upper end portions as the apex. The vehicle safety device control unit according to claim 1, wherein:
  3. 　車両用安全装置を制御する車両安全装置制御ユニットにおいて、
    　回路基板と、
    　前記回路基板の表面または裏面に搭載されたセンサと、
    　前記回路基板を被覆する筐体と、
    　前記回路基板の周縁を前記筐体の周縁部に固定する複数の固定具と、
    　前記回路基板の表面に搭載され前記筐体の天面方向に延び該天面から突出する保持部に保持される第１の電子部品とを備え、
    　第１の電子部品が保持された位置を頂点とする円錐であって、前記複数の固定具のうち第１の電子部品に近い少なくとも２つの固定具を内包する円を底面とする円錐の内部空間に前記センサが配置されていることを特徴とする車両安全装置制御ユニット。     In a vehicle safety device control unit for controlling a vehicle safety device,
    A circuit board;
    A sensor mounted on the front or back surface of the circuit board;
    A housing covering the circuit board;
    A plurality of fixtures for fixing the periphery of the circuit board to the periphery of the housing;
    A first electronic component mounted on the surface of the circuit board and held in a holding portion that extends in the top surface direction of the housing and protrudes from the top surface;
    An internal space of a cone whose top is a cone having a position where the first electronic component is held, the circle containing at least two fixtures close to the first electronic component among the plurality of fixtures. The vehicle safety device control unit is characterized in that the sensor is disposed in the vehicle.
  4. 　車両用安全装置を制御する車両安全装置制御ユニットにおいて、
    　回路基板と、
    　前記回路基板の表面または裏面に搭載されたセンサと、
    　前記回路基板を被覆する筐体と、
    　前記回路基板の周縁を前記筐体の周縁部に固定する複数の固定具と、
    　前記回路基板の表面に搭載され前記筐体の天面方向に延び該天面から突出する保持部に保持される第１の電子部品とを備え、
    　第１の電子部品が保持された位置を頂点とする円錐であって、前記頂点から前記回路基板に向かう垂線の該回路基板の表面との交点を中心とし前記頂点から交点までの距離に等しい半径を有する円を底面とする円錐の内部空間に前記センサが配置されていることを特徴とする車両安全装置制御ユニット。     In a vehicle safety device control unit for controlling a vehicle safety device,
    A circuit board;
    A sensor mounted on the front or back surface of the circuit board;
    A housing covering the circuit board;
    A plurality of fixtures for fixing the periphery of the circuit board to the periphery of the housing;
    A first electronic component mounted on the surface of the circuit board and held in a holding portion that extends in the top surface direction of the housing and protrudes from the top surface;
    A cone having a vertex at a position where the first electronic component is held, and a radius equal to a distance from the vertex to the intersection centered on an intersection with a surface of the circuit board of a perpendicular line from the vertex to the circuit board A vehicle safety device control unit, wherein the sensor is disposed in an inner space of a cone having a circle having a bottom surface.
  5. 　前記筐体の天面に取り付けられリード線を有する第２の電子部品をさらに備え、
    　第１の電子部品の上端には、第２の電子部品のリード線に電気的に接続し、前記筐体の天面から突出する保持部に保持される端子が形成されていることを特徴とする請求項１から４のいずれか１項に記載の車両安全装置制御ユニット。     A second electronic component attached to the top surface of the housing and having a lead wire;
    The upper end of the first electronic component is formed with a terminal that is electrically connected to the lead wire of the second electronic component and is held by a holding portion protruding from the top surface of the housing. The vehicle safety device control unit according to any one of claims 1 to 4.
  6. 　前記端子の先端が前記頂点であることを特徴とする請求項５に記載の車両安全装置制御ユニット。 The vehicle safety device control unit according to claim 5, wherein the tip of the terminal is the apex.
  7. 　第２の電子部品はコンデンサであることを特徴とする請求項５または６に記載の車両安全装置制御ユニット。 7. The vehicle safety device control unit according to claim 5 or 6, wherein the second electronic component is a capacitor.
  8. 　前記センサは加速度センサであることを特徴とする請求項１から７のいずれか１項に記載の車両安全装置制御ユニット。 The vehicle safety device control unit according to any one of claims 1 to 7, wherein the sensor is an acceleration sensor.
PCT/JP2014/073137 2013-10-31 2014-09-03 Vehicle safety device control unit WO2015064203A1 (en)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
JP2017132283A (en) * 2016-01-25 2017-08-03 株式会社デンソー Control device for occupant protection system
CZ310044B6 (en) * 2022-01-06 2024-06-12 Výzkumný a zkušební letecký ústav, a.s. A chassis of a sensor of a capacitive micro accelerometer

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JP2008089573A (en) * 2006-08-07 2008-04-17 Trw Automotive Gmbh Method for manufacturing sensor, and sensor
JP2010241249A (en) * 2009-04-03 2010-10-28 Fujitsu Ten Ltd Box body structure for on-vehicle electronic equipment
JP2011075442A (en) * 2009-09-30 2011-04-14 Fujitsu Ten Ltd Electronic control device
JP2012177652A (en) * 2011-02-28 2012-09-13 Keihin Corp Electronic control device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008089573A (en) * 2006-08-07 2008-04-17 Trw Automotive Gmbh Method for manufacturing sensor, and sensor
JP2010241249A (en) * 2009-04-03 2010-10-28 Fujitsu Ten Ltd Box body structure for on-vehicle electronic equipment
JP2011075442A (en) * 2009-09-30 2011-04-14 Fujitsu Ten Ltd Electronic control device
JP2012177652A (en) * 2011-02-28 2012-09-13 Keihin Corp Electronic control device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017132283A (en) * 2016-01-25 2017-08-03 株式会社デンソー Control device for occupant protection system
CZ310044B6 (en) * 2022-01-06 2024-06-12 Výzkumný a zkušební letecký ústav, a.s. A chassis of a sensor of a capacitive micro accelerometer

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JPWO2015064203A1 (en) 2017-03-09
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