JP2006337194A - Acceleration detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an acceleration detector capable of easily fixing on an acceleration detection object. <P>SOLUTION: The acceleration detector 1 comprises: the housing 10 for fixing on a vehicle (acceleration detection object); the sensor substrate 20 to be housed in the housing 10; and the a pair of the 1st and the 2nd sensor chips 2 and 3. The housing 10 comprises: the setting reference plane 11 to be fixed on the support member of vehicle side (acceleration detection object); the sensor substrate fixing surface 13 for seating the sensor substrate 20 perpendicular to the setting reference plane. A surface extending parallel to the sensor substrate fixing surface 13 is named as a virtual sensitivity axis setting surface C. Each sensitive axis of the 1st and the 2nd acceleration sensor chips 2 and 3 is tilted to the setting reference plane 11 (horizontal axis X) and mounted on the sensor substrate 20 for preventing the each sensitive axis is parallel to each other on the virtual sensitive axis setting surface C. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an acceleration detection device that is installed on an acceleration detection object and detects the acceleration.

  As a conventional acceleration sensor, for example, a pendulum that swings in accordance with the motion of an acceleration detection target and a detection device that detects the position of the pendulum are provided, and the position of the pendulum detected by the detection device is electromagnetically detected. Some have feedback control so that they do not move with the force generated by energizing the coil. At this time, paying attention to the fact that the force acting on the pendulum is equal to the acceleration applied to the pendulum (that is, the acceleration of the acceleration detection object), the acceleration of the acceleration detection object is detected as a current value flowing through the electromagnetic coil.

  Conventionally, the acceleration detection device disclosed in Patent Document 1 includes a pair of acceleration sensors that detect acceleration in a predetermined sensitivity axis direction, and the sensitivity axes of these acceleration sensors are not parallel to each other in a vertical plane. It is inclined with respect to the horizontal axis direction. Thereby, a detection signal is output from each of the pair of acceleration sensors according to the acceleration generated in the acceleration detection object.

  The controller calculates acceleration in a predetermined direction to be detected based on the detection signal output from each acceleration sensor, and acceleration detection is performed.

The pair of acceleration sensors is arranged with a predetermined inclination angle with respect to the horizontal axis, and outputs based on the gravitational acceleration even when the acceleration detection object is stationary, so the controller outputs the value of this output when normal. By comparing with the value to be detected, failure detection of the acceleration sensor is performed even at rest.
Japanese Patent Application Laid-Open No. 11-211751

  However, such a conventional acceleration detection device has a problem that, for example, when installed in a vehicle to detect rolling of the vehicle, it is difficult to place the sensitivity axes of the acceleration sensors at predetermined positions. It was.

  The present invention has been made in view of the above problems, and an object thereof is to provide an acceleration detection device that can be easily installed on an acceleration detection object.

  An acceleration detection apparatus according to the present invention includes a housing attached to an acceleration detection object, a sensor substrate housed in the housing, and an acceleration sensor chip that detects acceleration in a predetermined sensitivity axis direction. An installation reference plane fixed to the detection target and a sensor board mounting surface on which the sensor board is seated perpendicular to the installation reference plane are formed, and a plane extending parallel to the sensor board mounting surface is a virtual sensitivity axis setting plane. And an acceleration sensor chip is provided on the sensor substrate so that a plurality of sensitivity axes are not parallel to each other on the virtual sensitivity axis setting plane and are inclined with respect to the installation reference plane. did.

  According to the present invention, the acceleration detection device is attached to the acceleration detection object so that its installation reference plane is horizontal, so that the sensitivity axis of the acceleration sensor chip is at a predetermined angle with respect to the horizontal axis in the vertical plane. Since it arrange | positions so that it may incline, the attachment operation | work of a housing | casing can be performed easily.

  Since the acceleration detection device is arranged with the sensitivity axis of the acceleration sensor chip at a predetermined inclination angle with respect to the horizontal axis, the acceleration detection device outputs based on the gravitational acceleration even when the acceleration detection target is stationary. Is compared with a value that should be output during normal operation, so that the acceleration sensor can be detected even when stationary.

  By arranging the housing so that its sensor board mounting surface extends in the left-right direction with respect to the vehicle, for example, the acceleration detection device detects the left-right acceleration generated in the vehicle, and the vehicle rolls according to the detection signal. Can be controlled.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown to (a)-(c) of FIG. 1, the acceleration detection apparatus 1 is attached to the bogie (acceleration detection object) of a rail vehicle, detects the acceleration of the left-right direction of a bogie, and suppresses rolling of a vehicle. It constitutes a device that performs control.

  The acceleration detection device 1 includes a housing 10 attached to a carriage, a sensor substrate 20 accommodated in the housing 10, and a pair of first and second acceleration sensor chips 2 and 3 interposed in the sensor substrate 20. And a cable 30 connected to the sensor substrate 20 and extending to the outside of the housing 10, and detection signals of the first and second acceleration sensor chips 2 and 3 are sent to a controller (not shown) via the sensor substrate 20 and the cable 30. It is output.

  The housing 10 includes an installation reference surface 11 fixed to a support member (acceleration detection target) of the carriage, a pair of flange portions 15 protruding left and right, and bolt holes 16 formed in each flange portion 15. . The housing 10 is fastened to the support member of the carriage via three bolts (not shown) that pass through the respective bolt holes 16.

  The housing 10 has an opening in the installation reference plane 11 to accommodate the sensor board 20 and the like, a pair of left and right sensor board mounting surfaces 13 on which the sensor board 20 is seated, and a hole 14 through which the cable 30 is inserted. And have.

  As shown in FIG. 2, the sensor substrate 20 is formed in a rectangular flat plate shape. The sensor substrate 20 has left and right end portions 21 and 22 seated on each sensor substrate mounting surface 13, and left and right lower end portions 23 and 24 are fastened to the housing 10 via two screws 9. Holes 25 are respectively formed in the left and right lower end portions 23 and 24, and screws 9 are inserted into the respective holes 25.

  In the housing 10, each sensor board mounting surface 13 is orthogonal to the installation reference surface 11. The sensor board 20 is mounted so that its left and right end portions 21 and 22 are seated on each sensor board mounting surface 13, so that the sensor board 20 extends in a direction orthogonal to the installation reference plane 11.

  The first and second acceleration sensor chips 2 and 3 each have a chip body 6 and a plurality of terminals 7 extending from the chip body 6. Each terminal 7 is soldered to the circuit of the sensor substrate 20.

  Each conducting wire 31 of the cable 30 is inserted into each hole 26 of the sensor substrate 20, and each conducting wire 31 is soldered to the circuit of the sensor substrate 20.

  An insulating layer 27 coated with silicone is provided on both surfaces of the sensor substrate 20. The insulating layer 27 is provided so as to completely cover the connection portions of the first and second acceleration sensor chips 2 and 3 and the respective conductive wires 31, and can relieve stress due to thermal shock.

  The housing chamber 12 opened in the installation reference plane 11 of the housing 10 is provided with a resin portion 17 filled and solidified with a mixture of an epoxy resin and a curing agent. The resin portion 17 fixes the sensor substrate 20 and the first and second acceleration sensor chips 2 and 3 to the housing 10 and waterproofs them.

  The chip body 6 has a rectangular parallelepiped shape and is mounted in parallel to the sensor substrate 20, so that the chip body 6 is disposed in parallel to the sensor substrate mounting surface 13 and extends in a direction orthogonal to the installation reference surface 11. Placed in.

  The first and second acceleration sensor chips 2 and 3 have a pendulum that swings in accordance with the movement in the sensitivity axis direction, an element that generates an output corresponding to the force acting on the pendulum, and drives the element. And a circuit for outputting an acceleration detection signal.

  Each sensitivity axis of the first and second acceleration sensor chips 2 and 3 has a rectangular parallelepiped outer shape starting from the center of the chip body 6 as indicated by a white arrow in FIG. It is arranged in a direction perpendicular to the side portion 6a and parallel to the side portion 6b.

  Here, a plane extending in parallel with the sensor substrate mounting surface 13 is defined as a virtual sensitivity axis setting surface C. 3B, the horizontal axis X extends in parallel with the installation reference plane 11 in the virtual sensitivity axis setting plane C, and the vertical axis Y is also orthogonal to the installation reference plane 11 in the virtual sensitivity axis setting plane C.

  The acceleration detecting device 1 tilts the sensitivity axes of the first and second acceleration sensor chips 2 and 3 with respect to the installation reference plane 11 (horizontal axis X) so as not to be parallel to each other on the virtual sensitivity axis setting plane C.

  In FIG. 3B, the directions of the sensitivity axes of the first and second acceleration sensor chips 2 and 3 are indicated by vectors A and B, respectively. The sensitivity axes of the first and second acceleration sensor chips 2 and 3 have predetermined inclination angles θA and θB with respect to the horizontal axis X. In FIG. 1, since counterclockwise rotation is positive, θA is a positive value and θB is a negative value. In the present embodiment, θA is set to 45 ° and θB is set to −45 °.

  As shown in FIG. 3A, the first and second acceleration sensor chips 2 and 3 are offset in the direction orthogonal to the installation reference plane 11 (vertical Y direction) and parallel to the installation reference plane 11 ( The substrate 20 is interposed with an offset in the direction of the horizontal axis X).

  As shown in FIG. 3B, the vectors A and B indicating the directions of the sensitivity axes of the first and second acceleration sensor chips 2 and 3 are offset in the Y-direction on the vertical axis, and the horizontal axis Offset in the X direction.

  The acceleration detection apparatus 1 is configured as described above, and the operation and effect will be described next.

  By attaching the housing 10 to the support member (acceleration detection object) of the carriage so that the installation reference plane 11 is horizontal, the sensitivity axes of the first and second acceleration sensor chips 2 and 3 are horizontal in the vertical plane. Since it is arranged so as to be inclined at a predetermined angle with respect to the axial direction, the acceleration detecting device 1 can easily perform the mounting operation of the housing 10.

  The controller calculates horizontal acceleration in the horizontal axis X direction and vertical acceleration in the vertical axis Y direction based on the outputs of the first and second acceleration sensor chips 2 and 3, respectively.

  By arranging the housing 10 such that the sensor board mounting surface 13 extends in the vehicle left-right direction with respect to the vehicle carriage, the acceleration detection device 1 detects the acceleration in the left-right direction generated in the carriage, and according to this detection signal Control which suppresses rolling of a vehicle can be performed.

  Since the sensitivity axes of the pair of first and second acceleration sensor chips 2 and 3 are inclined at the same angle of 45 ° with respect to the horizontal axis X on the virtual sensitivity axis setting plane C, the attachment error of the acceleration detection device 1 Even if there is, the output corresponding to the horizontal acceleration of the acceleration detecting device 1 reflects only the horizontal acceleration in the direction of the horizontal axis X and can be made unaffected by the vertical acceleration, and the detection accuracy is not impaired. .

  The controller compares the acceleration in the vertical axis Y direction detected when the acceleration detection object (acceleration detection device 1) is stationary with the gravitational acceleration, and the acceleration detection device 1 (first and second acceleration sensor chips 2 and 3). Detects a malfunction. Thereby, the acceleration detection apparatus 1 that can detect a failure in a stationary state can be easily configured, and the cost of the apparatus can be reduced.

  The first and second acceleration sensor chips 2 and 3 are offset in the direction orthogonal to the installation reference plane 11 (vertical axis Y direction) and offset in the direction parallel to the installation reference plane 11 (horizontal axis X direction). By interposing, the space for interposing the first and second acceleration sensor chips 2 and 3 occupying the sensor substrate 20 is reduced, and the acceleration detecting device 1 can be downsized.

  By forming a housing chamber 12 that opens in the installation reference plane 11 in the housing 10 and accommodates the sensor substrate 20, and forms a resin portion 17 that is filled with resin and solidified in the housing chamber 12. The sensor substrate 20 and the first and second acceleration sensor chips 2 and 3 are fixed to the housing 10 via the resin portion 17 and the waterproofing of these is taken.

  Next, another embodiment shown in FIG. 4 will be described. In addition, the same code | symbol is attached | subjected to the same structure part as the said embodiment.

  A two-axis detection type acceleration sensor chip 8 is interposed on the sensor substrate 20. The acceleration sensor chip 8 has two sensitivity axes that are orthogonal to each other. One sensitivity axis starts from the center of the chip body 6 and extends parallel to one side 6a of the chip body 6 having a rectangular parallelepiped shape, as indicated by the white arrow in FIG. The other sensitivity axis may be parallel to the other side 6b of the chip body 6 starting from the center of the chip body 6 as indicated by the white arrow in FIG.

  The acceleration sensor chip 8 is interposed on the sensor substrate 20 so that these sensitivity axes are inclined at the same angle of 45 ° with respect to the horizontal axis X on the virtual sensitivity axis setting plane C.

  Also in this case, the sensitivity axis of the acceleration sensor chip 8 is in the vertical plane with respect to the horizontal axis direction by attaching the housing 10 to the carriage support member (acceleration detection object) so that the installation reference plane 11 is horizontal. Therefore, the acceleration detecting device 1 can easily perform the mounting operation of the housing 10.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  The acceleration detection device of the present invention can be used for a device that detects a shake of a vehicle or a building, another machine, or the like.

1 shows an embodiment of the present invention, (a) is a plan view of an acceleration detection device as viewed from above, (b) is a sectional view taken along line AA of FIG. 1 in (a), and (c) is acceleration detection. The top view which looked at the apparatus from the downward direction. Similarly, a sensor board, an acceleration sensor chip, etc. are shown, (a) is the side view, and (b) is the front view. Similarly, (a) is a side view showing a sensor substrate, an acceleration sensor chip, and the like, and (b) is a diagram showing a direction vector of a sensitivity axis on a virtual sensitivity axis setting plane C. The side view of the sensor board | substrate and acceleration sensor chip which show other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Acceleration detection apparatus 2 1st acceleration sensor chip 3 2nd acceleration sensor chip 8 Acceleration sensor chip 10 Housing | casing 11 Installation reference plane 12 Storage chamber 13 Sensor substrate mounting surface 17 Resin part 20 Sensor substrate

Claims (4)

  A housing that is attached to the acceleration detection object, a sensor substrate that is housed in the housing, and an acceleration sensor chip that detects acceleration in a predetermined sensitivity axis direction are fixed to the acceleration detection object on the housing. And a sensor board mounting surface on which the sensor board is seated perpendicularly to the installation reference plane, and a plane extending parallel to the sensor board mounting surface as a virtual sensitivity axis setting plane, and the acceleration An acceleration detection apparatus, wherein a sensor chip is interposed in the sensor substrate so that a plurality of sensitivity axes are not parallel to each other on the virtual sensitivity axis setting plane and are inclined with respect to the installation reference plane.   2. The acceleration detection apparatus according to claim 1, wherein each sensitivity axis of the acceleration sensor chip is inclined at an angle of 45 degrees with respect to the installation reference plane.   The first and second acceleration sensor chips having different sensitivity axes are offset, and the first and second acceleration sensor chips are offset in a direction orthogonal to the installation reference plane and offset in a direction parallel to the installation reference plane. The acceleration detection device according to claim 1, wherein the acceleration detection device is interposed in the sensor substrate.   The housing is formed with an accommodation chamber in which the sensor substrate is accommodated by opening in the installation reference plane, and a resin portion filled with resin and solidified in the accommodation chamber is formed. The acceleration detection apparatus according to any one of 1 to 3.

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