JP2006337196A - Multiaxial acceleration detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiaxial acceleration detector capable of being easily fixed to an acceleration detection object. <P>SOLUTION: The multiaxial acceleration detector 1 comprises: the housing 10 to be fixed to a truck (acceleration detection object); the pair of each sensor substrate 20 and 29 to be housed in the housing 10; and the acceleration sensor chips 2-5. The housing 10 includes: the fixing reference surface 11 to be fixed with the supporting member (acceleration detection object) of the vehicle side; and the sensor fixing surface 13 and 19 for seating the respective sensor substrates 20 and 29. Each surface extending parallel to the sensor substrate fixing surfaces 13 and 19 is named as a virtual sensitive axis setting surface, each of acceleration sensor chips 2-5 is mounted on each substrate 20 or 29 so that a plurality of sensitive axes of which are not parallel in each virtual sensitivity axis surface and tilting to the setting reference surface 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a multi-axis 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 a multi-axis acceleration detection device that can be easily installed on an acceleration detection object.

  A multi-axis acceleration detection device according to the present invention includes a housing attached to an acceleration detection object, a plurality of sensor substrates housed in the housing, and a plurality of acceleration sensor chips that detect acceleration in a predetermined sensitivity axis direction. Each of the sensor board mounting surface and a plurality of sensor board mounting surfaces on which the respective sensor boards are seated perpendicularly to the installation reference plane. Each of the sensor substrates has a plane extending in parallel as a virtual sensitivity axis setting surface, and each acceleration sensor chip is tilted with respect to the installation reference plane so that a plurality of sensitivity axes are not parallel to each other on each virtual sensitivity axis setting surface. It was characterized by having been interposed respectively.

  According to the present invention, the multi-axis acceleration detecting device is attached to the acceleration detection target so that its installation reference plane is horizontal, so that the sensitivity axis of each acceleration sensor chip is in the vertical plane with respect to the horizontal axis. Since it arrange | positions so that it may incline at a predetermined angle, 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 one sensor board mounting surface extends in the left-right direction with respect to the vehicle, for example, the multi-axis acceleration detecting device detects the left-right acceleration generated in the vehicle, and the vehicle is detected according to the detection signal. It is possible to perform control to suppress the rolling of the. Then, by arranging the housing so that another sensor board mounting surface extends in the front-rear direction with respect to the vehicle, for example, the multi-axis acceleration detection device detects the acceleration in the front-rear direction generated in the carriage, and performs various controls of the vehicle. It can be carried out.

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

  As shown in FIGS. 1 (a) and 1 (b), the multi-axis acceleration detecting device 1 is attached to a bogie (acceleration detection object) of a railway vehicle and detects accelerations in the left-right direction and the front-back direction of the bogie. It is.

  The multi-axis acceleration detection apparatus 1 includes a housing 10 attached to a carriage, a pair of sensor substrates 20 and 29 housed in the housing 10, and two pairs of acceleration sensors interposed between the sensor substrates 20 and 29. Chips 2 to 5 and a cable 30 that is also connected to the sensor substrates 20 and 29 and extends to the outside of the housing 10, and detection signals of the acceleration sensor chips 2 to 4 connect the sensor substrates 20 and 29 and the cable 30. Via a controller (not shown).

  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 includes an accommodation chamber 12 that opens to the installation reference plane 11 and accommodates the sensor boards 20 and 29, a pair of left and right sensor board mounting surfaces 13 on which the sensor board 20 is seated, and a sensor board 29. It has a pair of front and rear sensor board mounting surfaces 19 to be seated and a hole 14 through which the cable 30 is inserted.

  As shown in FIG. 2, one 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. The other sensor substrate 29 has the same structure as the sensor substrate 20.

  In the housing 10, the sensor board mounting surfaces 13 and 19 are orthogonal to the installation reference surface 11. Each sensor board 20, 29 is attached with its left and right end portions 21, 22 seated on each sensor board attachment surface 13, 19, so that each sensor board 20, 29 is orthogonal to the installation reference plane 11. It is arranged to extend.

  The sensor board mounting surfaces 13 and 19 are orthogonal to each other. The housing 10 is arranged such that the sensor board mounting surface 13 extends in the left-right direction of the vehicle and the sensor board mounting surface 19 extends in the front-rear direction of the vehicle.

  The acceleration sensor chips 2 to 5 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 each sensor board 20, 29.

  Each conducting wire 31 of the cable 30 is inserted into each hole 26 of each sensor substrate 20, 29, and each conducting wire 31 is soldered to the circuit of each sensor substrate 20, 29.

  An insulating layer 27 coated with silicone is provided on both surfaces of each sensor substrate 20, 29. The insulating layer 27 is provided so as to completely cover the connection portions of the 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 substrates 20 and 29 and the acceleration sensor chips 2 to 5 to the housing 10 and waterproofs them.

  The chip body 6 has a rectangular parallelepiped shape and is mounted in parallel to the sensor substrates 20 and 29, so that the chip body 6 is arranged in parallel to the sensor substrate mounting surfaces 13 and 19, with respect to the installation reference surface 11. So as to extend in the orthogonal direction.

  Each of the acceleration sensor chips 2 to 5 includes a pendulum that tries to swing 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 an acceleration detection signal by driving the element. And a circuit for outputting.

  As shown by white arrows in FIG. 3A, the sensitivity axes of the acceleration sensor chips 2 and 3 start from the center of the chip body 6 and have side portions 6a of the chip body 6 having a rectangular parallelepiped shape. Is arranged in a direction that is orthogonal to 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 multi-axis acceleration detection apparatus 1 tilts the sensitivity axes of the 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 acceleration sensor chips 2 and 3 are indicated by vectors A and B, respectively. The sensitivity axes of the 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 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 (horizontal X direction). And is inserted into the substrate 20 with an offset.

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

  The sensitivity axes of the acceleration sensor chips 4 and 5 are inclined with respect to the installation reference plane 11 in the same positional relationship as the acceleration sensor chips 2 and 3.

  The multi-axis acceleration detection device 1 is configured as described above, and the operation and effect will be described next.

  By attaching the casing 10 to a support member (acceleration detection object) of the carriage so that the installation reference plane 11 is horizontal, each sensitivity axis of each acceleration sensor chip 2 to 5 is in the vertical plane with respect to the horizontal axis direction. Therefore, the multi-axis acceleration detection device 1 can easily perform the mounting operation of the housing 10.

The controller calculates the horizontal acceleration in the horizontal axis X direction and the vertical acceleration in the vertical axis Y direction based on the outputs of the acceleration sensor chips 2 and 3, respectively, and the front and rear axes based on the outputs of the acceleration sensor chips 4 and 5 respectively. The horizontal acceleration in the direction and the vertical acceleration in the Y-axis direction are calculated.

  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 lateral acceleration generated in the carriage is detected based on the outputs of the acceleration sensor chips 2 and 3. Thus, it is possible to perform control for suppressing the rolling of the vehicle according to the detection signal.

  By arranging the housing 10 so that the sensor board mounting surface 19 extends in the vehicle longitudinal direction with respect to the vehicle carriage, the longitudinal acceleration generated in the carriage is detected based on the outputs of the acceleration sensor chips 4 and 5. Various controls of the vehicle can be performed according to the detection signal.

  Since the sensitivity axes of the acceleration sensor chips 2 to 5 are inclined at the same angle of 45 ° with respect to the horizontal axis X on the virtual sensitivity axis setting surface, even if there is an attachment error of the multi-axis acceleration detection device 1 The output corresponding to the horizontal acceleration of the multi-axis acceleration detecting device 1 can be made not to be affected by the vertical acceleration, and the detection accuracy is not impaired.

  The controller compares the acceleration in the Y-axis of the vertical axis detected when the acceleration detection object (multi-axis acceleration detection device 1) is stationary with the gravitational acceleration, and multi-axis acceleration detection device 1 (each acceleration sensor chip 2-5). Detects a malfunction.

  The acceleration sensor chips 2 and 3 and the acceleration sensor chips 4 and 5 that are paired with each other are offset in the direction orthogonal to the installation reference plane 11 (in the vertical axis Y direction) and parallel to the installation reference planes 11 and 19. By interposing the sensor boards 20 and 29 with the direction being offset, the space for interposing the acceleration sensor chips 2 and 3 occupying the sensor boards 20 and 29 can be reduced, and the multi-axis acceleration detection device 1 can be downsized. Peeled off.

  A housing chamber 12 is formed in the housing 10 so as to open to the installation reference plane 11 and accommodate the sensor substrates 20 and 29, and a resin portion 17 filled with resin and solidified in the housing chamber 12 is formed. As a result, the sensor substrates 20 and 29 and the acceleration sensor chips 2 to 5 are fixed to the housing 10 via the resin portion 17, and waterproofing of the sensor substrates 20 and 29 is achieved.

  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 multi-axis acceleration detection 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 multi-axis 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 cross-sectional view of a multi-axis acceleration detection device, (b) is a plan view of the multi-axis acceleration detection device as viewed from below. 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 Multi-axis acceleration detection apparatus 2-5 Acceleration sensor chip 8 Acceleration sensor chip 10 Housing | casing 11 Installation reference plane 12 Storage chamber 13, 19 Sensor substrate mounting surface 17 Resin part 20, 29 Sensor substrate

Claims (5)

  A housing attached to the acceleration detection object; a plurality of sensor boards housed in the housing; and a plurality of acceleration sensor chips that detect acceleration in a predetermined sensitivity axis direction; the acceleration detection object in the housing And a plurality of sensor board mounting surfaces for seating each sensor board perpendicular to the installation reference plane, and each plane extending in parallel with each sensor board mounting surface. A virtual sensitivity axis setting surface is provided, and the acceleration sensor chip is interposed on each sensor substrate so that a plurality of sensitivity axes are not parallel to each other and are inclined with respect to the installation reference surface on each virtual sensitivity axis setting surface. A multi-axis acceleration detection device characterized by wearing.   The multi-axis acceleration detecting device according to claim 1, wherein the virtual sensitivity axis setting surfaces of a pair are orthogonal to each other.   3. The multi-axis acceleration detecting device according to claim 1, wherein each sensitivity axis of the acceleration sensor chip is inclined at an angle of 45 ° with respect to the installation reference plane.   A pair of acceleration sensor chips having different sensitivity axes is provided, and each acceleration sensor chip is offset in a direction orthogonal to the installation reference plane, and is offset in a direction parallel to the installation reference plane and interposed in the sensor substrate. The multi-axis acceleration detection device according to claim 1, wherein the multi-axis acceleration detection device is a multi-axis acceleration detection device.   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 multi-axis acceleration detection device according to any one of 1 to 4.

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