JP2020016548A - In-vehicle sensor equipment - Google Patents

Abstract

To provide new in-vehicle sensor equipment capable of, for example, improving the effect of vibrations transmitted from a vehicle body to the sensor assembly.SOLUTION: The in-vehicle sensor equipment of an embodiment has a supporting part that includes; for example, a sensor assembly having a sensor; and a vibration adjustment member that is interposed in the vibration transmission path between the vehicle body and the sensor assembly for further increasing the vibration transmissibility at the time of resonance of the sensor assembly, and which is arranged in series between an elastic member and the vibration member, and for reducing the vibration transmissibility in the frequency band used for the detection signal by the sensor higher than the resonance frequency of the sensor assembly.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an in-vehicle sensor device.

  Conventionally, an in-vehicle sensor device including a sensor assembly having a sensor and a vibration damping member interposed in a vibration transmission path between a vehicle body and the sensor assembly has been known.

JP-A-2003-4448

  In this type of in-vehicle sensor device, there is still room for improvement in, for example, suppressing the effect of vibration transmitted from a vehicle body.

  Therefore, one of the objects of the present invention is to obtain a novel on-vehicle sensor device capable of improving the influence of vibration transmitted from a vehicle body to a sensor assembly, for example.

  The on-vehicle sensor device of the embodiment includes, for example, a sensor assembly having a sensor, a vibration transmission path between the vehicle body and the sensor assembly, an elastic member, and an elastic member provided in series with the elastic member. A vibration adjusting member that further increases the vibration transmissibility at the time of resonance and reduces the vibration transmissibility in the frequency band used by the sensor that is higher than the resonance frequency of the sensor assembly. .

  According to such a configuration, for example, the peak of the vibration transmissivity at the resonance frequency of the sensor assembly is made higher (sharp) and the foot portion of the vibration transmissivity is narrower than in the case where the vibration adjusting member is not provided. At the same time, the vibration transmissibility in the foot portion can be reduced. Therefore, the influence of the resonance of the sensor assembly on the detection signal by the sensor can be reduced.

  In the above-mentioned in-vehicle sensor device, for example, a casing that accommodates the sensor assembly and is fixed to the vehicle body is provided, and the elastic member and the vibration adjustment member are disposed between the casing and the sensor assembly in the casing. Intervened. According to such a configuration, for example, the elastic member and the vibration adjusting member can be protected by the casing.

  Further, the on-vehicle sensor device includes, for example, an application type vibration damping material applied to the elastic member. According to such a configuration, for example, noise or vibration of the elastic member at the time of resonance of the sensor assembly can be suppressed by the application type vibration damping material.

  In the on-vehicle sensor device, for example, the sensor assembly includes a filter unit that performs a filter process for blocking a frequency band lower than a frequency band used by the detection signal. According to such a configuration, for example, the filter section attenuates and blocks the detection signal from the sensor in the frequency band (resonance frequency) lower than the used frequency band, and passes only the detection signal from the sensor in the used frequency band. be able to.

FIG. 1 is an exemplary perspective view showing a state in which a part of a cabin of a vehicle according to an embodiment is seen through. FIG. 2 is an exemplary plan view (bird's eye view) of the vehicle according to the embodiment from above. FIG. 3 is an exemplary block diagram showing a schematic configuration inside the vehicle of the embodiment. FIG. 4 is an exemplary and schematic cross-sectional view of the vehicle-mounted sensor device according to the embodiment, and is a cross-sectional view taken along line IV-IV of FIG. 2. FIG. 5 is an exemplary block diagram of the vehicle-mounted sensor device according to the embodiment. FIG. 6 is an exemplary diagram showing the relationship between the vibration frequency and the vibration transmissibility in the vehicle-mounted sensor device of the embodiment and the comparative example. FIG. 7 is an exemplary schematic cross-sectional view of a vehicle-mounted sensor device according to a first modification. FIG. 8 is an exemplary and schematic cross-sectional view of a vehicle-mounted sensor device according to a second modification. FIG. 9 is an exemplary schematic cross-sectional view of a vehicle-mounted sensor device according to a third modification. FIG. 10 is an exemplary schematic cross-sectional view of a vehicle-mounted sensor device according to a fourth modification. FIG. 11 is an exemplary schematic cross-sectional view of a vehicle-mounted sensor device according to a fifth modification. FIG. 12 is an exemplary schematic cross-sectional view of a vehicle-mounted sensor device according to a sixth modification.

  Hereinafter, exemplary embodiments and modifications of the present invention will be disclosed. The configurations of the embodiments and the modifications described below, and the operations and effects provided by the configurations are examples. The present invention can be realized by configurations other than those disclosed in the following embodiments and modified examples. Further, according to the present invention, at least one of various effects (including derivative effects) obtained by the configuration can be obtained.

  Embodiments and modifications disclosed below include similar components. Therefore, in the following, the same components are assigned the same reference numerals, and redundant description is omitted. In this specification, ordinal numbers are used only for distinguishing parts, members, parts, positions, directions, and the like, and do not indicate an order or a priority.

  In the following drawings, three directions orthogonal to each other are defined for convenience. The X direction is along the vehicle longitudinal direction, the Y direction is along the vehicle width direction, and the Z direction is along the vehicle up-down direction.

[Embodiment]
FIG. 1 is a perspective view showing a state in which a part of a cabin 2a of the vehicle 1 is seen through, and FIG. 2 is a plan view (bird's eye view) of the vehicle 1 from above. As shown in FIG. 1, a vehicle room 2 a in which an occupant (not shown) rides is provided inside the vehicle 1. The vehicle compartment 2a is provided with a steering unit 4, an acceleration operation unit 5, a braking operation unit 6, a shift operation unit 7, and the like in a state in which a driver as a user can operate from a driver's seat 2b.

  The steering section 4 is a steering wheel protruding from a dashboard (instrument panel). The acceleration operation unit 5 is an accelerator pedal provided under the driver's feet. The braking operation unit 6 is a brake pedal provided under the driver's feet. The shift operation section 7 is a shift lever protruding from the center console.

  Further, a monitor device 11 having a display device 8 capable of outputting various images and an audio output device 9 capable of outputting various sounds is provided in the passenger compartment 2a. The monitor device 11 is provided at the center of the dashboard in the vehicle interior 2a in the vehicle width direction (Y direction). The display device 8 is configured by an LCD (Liquid Crystal Display), an OELD (Organic Electroluminescence Display), or the like. For example, an image obtained by capturing an image of the periphery of the vehicle 1 or an image of the vehicle 1 viewed from above from above. It is configured to display various images and the like. An image obtained by imaging the periphery of the vehicle 1 is referred to as a peripheral image or the like, and an image of the vehicle 1 as viewed from above from above is referred to as an overhead image or a bird's-eye image.

  A touch panel 10 capable of detecting coordinates of a position where a pointer such as a finger or a stylus approaches or touches the display screen in an area where an image is displayed on the display device 8, that is, a display screen is provided. . The user can visually recognize an image displayed on the display screen of the display device 8 and inputs various operations by performing an input operation (for example, a touch operation) using the pointer on the touch panel 10. be able to.

  Note that the monitor device 11 may include various physical operation input units such as switches, dials, joysticks, and push buttons. Further, another audio output device may be provided in the compartment 2a at a position different from the position of the monitor device 11. In this case, various types of sound information can be output from both the sound output device 9 and the other sound output devices. The monitor device 11 may be configured to be able to display information on various systems such as a navigation system and an audio system.

  As shown in FIGS. 1 and 2, the vehicle 1 is, for example, a four-wheeled vehicle having two left and right front wheels 3F and two left and right rear wheels 3R. Hereinafter, the front wheel 3F and the rear wheel 3R may be collectively referred to as wheels 3 for convenience. In the present embodiment, the sideslip angles of some or all of the four wheels 3 change (steer) according to the steering of the steering unit 4 or the like.

  Further, the vehicle 1 is provided with a plurality of imaging units 15a and 15b. The imaging unit 15 a is provided at a rear end 2 e of the vehicle body 2 (for example, below the rear trunk door 2 h) and captures an image of an area behind the vehicle 1. The imaging unit 15b is provided at a front end 2c (for example, a front bumper) of the vehicle body 2 and captures an image of a region in front of the vehicle 1. Hereinafter, the imaging units 15a and 15b may be collectively referred to as the imaging unit 15 for convenience.

  The imaging unit 15 is a so-called digital camera having an imaging device such as a CCD (charge coupled device) or a CIS (CMOS (complementary metal oxide semiconductor) image sensor). The imaging unit 15 captures an image of the periphery of the vehicle 1 at a predetermined frame rate, and outputs image data of a captured image obtained by the imaging. The image data obtained by the imaging unit 15 can form a moving image as a frame image.

  The image data obtained by the imaging unit 15 can be used to detect a three-dimensional object existing around the vehicle 1. The three-dimensional object includes a stationary object such as another parked vehicle, a moving object such as a moving pedestrian, and the like. Note that an imaging unit similar to the imaging units 15a and 15b may be further added to the vehicle 1 at a position different from the imaging units 15a and 15b. In that case, the additional imaging unit may be provided on the side surface of the vehicle body 2 so as to be able to image the side of the vehicle 1, for example.

  Further, the vehicle 1 is provided with a plurality of distance measurement sensors 16a and 16b. The distance measurement sensor 16a is provided at the rear end 2e of the vehicle body 2, and detects a distance to a three-dimensional object existing behind the vehicle 1. The distance measurement sensor 16b is provided at the front end 2c of the vehicle body 2 and detects a distance to a three-dimensional object existing in front of the vehicle 1. The definition of the three-dimensional object referred to here is the same as that described above. Hereinafter, the distance measuring sensors 16a and 16b may be collectively referred to as a distance measuring sensor 16 for convenience.

  The distance measurement sensor 16 emits light such as a laser beam and receives light reflected from a three-dimensional object existing around the vehicle 1. Then, the distance measurement sensor 16 detects (specifies and calculates) the distance from the vehicle 1 to the obstacle based on the result of receiving the reflected light from the three-dimensional object. Note that, similarly to the imaging unit 15 described above, a ranging sensor similar to the ranging sensors 16a and 16b may be further added to the vehicle 1 at a position different from the ranging sensors 16a and 16b.

  Further, as shown in FIG. 2, in the present embodiment, the vehicle 1 is provided with the biological sensor unit 100. Although details will be described later, the biosensor unit 100 transmits an electromagnetic wave, an ultrasonic wave, or the like to a detection target (occupant of the vehicle 1) and senses the degree of transmission, reflection, absorption, or the like of the signal, thereby detecting the detection target. This is a device that outputs a detection signal (sensor signal) including a biological signal indicating biological information such as body movement, respiration, and heart rate. The biological sensor unit 100 is an example of a vehicle-mounted sensor device.

  In the present embodiment, the case where the biometric sensor unit 100 is provided on the ceiling portion of the passenger compartment 2a is exemplified. However, the present invention is not limited to this example. For example, a dashboard, a seat (seat back), etc. It may be provided in a part. The biological sensor unit 100 is provided at a position corresponding to the driver's seat 2b for detecting the biological information of the driver, but is not limited to this example, and detects the biological information of the occupants other than the driver. For example, it may be provided at another position that does not correspond to the driver's seat 2b. Further, a plurality of biological sensor units 100 may be provided in the vehicle 1.

  FIG. 3 is an exemplary block diagram showing a schematic configuration inside the vehicle 1. As shown in FIG. 3, the vehicle 1 includes a monitor device 11, a steering system 13, an imaging unit 15, a distance measurement sensor 16, a brake system 18, a steering angle sensor 19, an accelerator sensor 20, A shift sensor 21, a wheel speed sensor 22, an ECU (electronic control unit) 24, and a biological sensor unit 100 are provided.

  The monitor device 11, the steering system 13, the distance measurement sensor 16, the brake system 18, the steering angle sensor 19, the accelerator sensor 20, the shift sensor 21, the wheel speed sensor 22, the ECU 24, and the biological sensor unit 100 are mounted on a vehicle as an electric communication line. They are electrically connected via a network 23. The in-vehicle network 23 is configured by, for example, a CAN (controller area network) or the like.

  The steering system 13 is an electric power steering system, an SBW (steer-by-wire) system, or the like. The steering system 13 has an actuator 13a and a torque sensor 13b. The steering system 13 steers a part or all of the wheels 3 by operating the actuator 13a under the control of the ECU 24 or the like. The torque sensor 13b detects a torque generated in response to an operation of the steering unit 4 by the driver, and transmits a detection result to the ECU 24.

  The brake system 18 includes an ABS (anti-lock brake system), an anti-skid device (ESC), an electric brake system, a BBW (brake-by-wire), and the like. The brake system 18 has an actuator 18a and a brake sensor 18b. The brake system 18 applies a braking force to the wheels 3 by operating the actuator 18a under the control of the ECU 24 or the like. The brake sensor 18b detects the position (displacement) of a brake pedal as a movable part in the braking operation unit 6, and transmits the detection result to the ECU 24.

  The steering angle sensor 19 is a sensor that detects the amount of operation of the steering unit 4 by the driver. The steering angle sensor 19 is configured by, for example, a hall element or the like, detects a rotation angle of a rotating portion of the steering unit 4 as a steering amount, and transmits a detection result to the ECU 24. The accelerator sensor 20 detects the position (displacement) of an accelerator pedal as a movable part in the acceleration operation unit 5 and transmits the detection result to the ECU 24.

  The shift sensor 21 detects the position of a movable part such as a shift lever in the shift operation unit 7 and transmits the detection result to the ECU 24. The wheel speed sensor 22 detects the amount of rotation of the wheel 3, the number of rotations of the wheel 3 per unit time, and the like, and transmits the detection result to the ECU 24.

  The ECU 24 generally includes a CPU (central processing unit) 24a, a ROM (read only memory) 24b, a RAM (random access memory) 24c, a display control unit 24d, a voice control unit 24e, and an SSD (solid state drive) 24f. Has the same hardware configuration as that of the computer.

  The CPU 24a is a control unit that controls the entire vehicle 1. The CPU 24a reads out a program stored in a storage device such as the ROM 24b or the SSD 24f, and executes various processes by operating according to instructions included in the program. The RAM 24c is used, for example, as a work area when the CPU 24a executes various processes.

  The display control unit 24d controls image output via the display device 8. Further, the audio control unit 24e controls the audio output via the audio output device 9. In the ECU 24, the CPU 24a, the ROM 24b, and the RAM 24c may be mounted on one integrated circuit. In the ECU 24, a processor such as a DSP (Digital Signal Processor) or a logic circuit may be provided instead of the CPU 24a as a control unit for controlling the entire vehicle 1.

  Further, as a main storage device for storing programs executed by the CPU 24a, a hard disk drive (HDD) may be provided instead of the SSD 24f (or in addition to the SSD 24f). Further, an external device connected to the ECU 24 may include the SSD 24f as a main storage device.

  As described above, the ECU 24 transmits the control signal to each unit of the vehicle 1 via the in-vehicle network 23 to control each unit of the vehicle 1 comprehensively. At this time, the ECU 24 can use image data obtained from the imaging unit 15 and detection results of various sensors obtained via the in-vehicle network 23 for control. In addition, the ECU 24 can also use information related to an input operation using the touch panel 10 acquired via the in-vehicle network 23 for control.

  By the way, as described above, the biological sensor unit 100 is a device that outputs a detection signal (sensor signal) corresponding to biological information on body motion, respiration, heartbeat, and the like of a human (occupant of the vehicle 1) as a sensing result. is there. For this reason, generally, the output level of the detection signal of the biological sensor unit 100 is very small. Therefore, when the noise resulting from the vibration of the vehicle 1 is superimposed on the detection signal, there is a possibility that the biological signal indicating the biological information that is the original detection target included in the detection signal may be buried in the noise.

  Therefore, in the present embodiment, by configuring the biosensor unit 100 as described below, even in an environment where noise due to vibration is generated, the influence of the noise is removed, and the biological sensor unit 100 can be used as an original detection target. It is possible to more accurately detect a certain biological signal.

  FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 2, and FIG. 5 is a block diagram of the biological sensor unit 100. As shown in FIG. 4, the biological sensor unit 100 includes, for example, a sensor assembly 110, a support 120, and a casing 125.

  The casing 125 is formed in, for example, a rectangular box shape. The sensor assembly 110 and the support 120 are accommodated in the casing 125. A hooked portion 126 on which the elastic member 121 of the support portion 120 is hooked is provided on the inner surface of the casing 125. The hooked portion 126 is also referred to as a hook metal fitting, a hook metal fitting, or the like.

  The casing 125 is fixed to the ceiling 500 of the vehicle compartment 2a by, for example, a fastener such as a screw or an adhesive. In the present embodiment, the casing 125 is provided so as to be exposed outside the ceiling 500, but is not limited to this example, and may be provided inside the ceiling 500 (for example, inside the headlining). Good.

  The sensor assembly 110 is suspended from the upper wall of the casing 125 by, for example, the support 120. 4 and 5, the sensor assembly 110 includes, for example, a sensor 111, a substrate 112, and an MCU 113 (micro control unit).

  The board 112 is supported by the casing 125 via the support 120 in a posture intersecting (orthogonal to) the vehicle vertical direction (Z direction). On the substrate 112, a sensor 111, an MCU 113, and the like are mounted. The substrate 112 is also called a first substrate, a main substrate, or the like.

  The sensor 111 has, for example, a plurality of (only one is shown in FIG. 4) communication modules 111a provided on the lower surface 112a of the substrate 112 on the detection target (occupant of the vehicle 1) side. The plurality of communication modules 111a are provided at intervals in a direction along the substrate 112, and function as antennas for transmitting and receiving electromagnetic waves, ultrasonic waves, and the like.

  The sensor 111 transmits an electromagnetic wave, an ultrasonic wave, or the like to the detection target (occupant of the vehicle 1) via the communication module 111a, and senses the degree of transmission, reflection, absorption, or the like of the signal, thereby detecting the body of the detection target. A detection signal including a biological signal indicating biological information such as movement, respiration, and heart rate is output to the MCU 113.

  The support part 120 is provided between the sensor assembly 110 and the casing 125. In the present embodiment, for example, a plurality (four) of support parts 120 are provided corresponding to the corners (four corners) of the substrate 112.

  The support section 120 has, for example, an elastic member 121 and a vibration adjusting member 122, respectively. The elastic member 121 and the vibration adjusting member 122 are interposed between the sensor assembly 110 and the wall of the casing 125 while being connected in series with each other.

  Note that the support portion 120 is not limited to this example, and may be provided, for example, between the casing 125 and the ceiling 500 (the vehicle body 2). In this case, the sensor assembly 110 may be supported on a wall of the casing 125, for example. Further, the support portions 120 may be provided on both the inside and the outside of the casing 125.

  The elastic member 121 is, for example, a coil spring that can elastically expand and contract in the axial direction. One end of the elastic member 121 is hooked on the hooked portion 126 of the casing 125, and the other end is hooked on the hooked portion 124 of the vibration adjusting member 122.

  The elastic member 121 is used as a tension spring between the casing 125 and the vibration adjusting member 122 in a state where the elastic member 121 is elastically extended beyond its free length. The plurality of elastic members 121 support the sensor assembly 110 in a state separated from the wall of the casing 125, that is, in a suspended state.

  Further, the plurality of elastic members 121 are in a state capable of absorbing (attenuating) vibrations in, for example, three directions of the vehicle front-rear direction (X direction), the vehicle width direction (Y direction), and the vehicle vertical direction (Z direction). As shown in FIG.

  In addition, the number of the elastic members 121 and the vibration adjusting members 122 is not limited to four, and may be, for example, three or five or more. Further, the elastic member 121 and the vibration adjusting member 122 are not limited to the corners of the substrate 112, and may be provided at, for example, an end (side) of the substrate 112 or the like.

  The vibration adjusting member 122 has, for example, a block shape, and is fixed to the upper surface 112b of the substrate 112 by screwing, bonding, or the like. The vibration adjusting member 122 attenuates or amplifies vibrations at various frequencies transmitted from the ceiling 500 to the sensor assembly 110 by being interposed in series with the elastic member 121 in a vibration transmission path between the ceiling 500 and the sensor assembly 110. Has a function.

  The vibration adjusting member 122 is, for example, a vibration damping material, and is made of a gel-like member such as an ultra-soft elastomer or a polymer material such as rubber, polyethylene resin, or soft urethane foam. In the present embodiment, the vibration adjusting member 122 is provided between the elastic member 121 and the substrate 112, but is not limited to this example, and is provided between the elastic member 121 and the wall of the casing 125. You may be.

  FIG. 6 is a diagram illustrating the relationship between the vibration frequency and the vibration transmissibility in the biological sensor unit 100 of the present embodiment and the comparative example. In FIG. 6, a broken line indicates characteristics in a comparative example having only the elastic member 121 without the vibration adjusting member 122, and a solid line indicates a biosensor unit of the present embodiment having the elastic member 121 and the vibration adjusting member 122. The characteristics at 100 are shown.

  As shown by the broken line in FIG. 6, in the comparative example, the resonance frequency fr in the spring mass system including the sensor assembly 110 and the elastic member 121 is different from the used frequency band (effective frequency band) from the frequency f1 to the frequency f2 (> f1). The specifications such as the spring constant of the elastic member 121 are adjusted in accordance with the mass of the sensor assembly 110 so as to be lower than the above. That is, the use frequency band (f1 to f2) is set higher than the resonance frequency fr. Thereby, the influence of the resonance of the sensor assembly 110 on the detection signal can be suppressed to some extent.

  However, in the comparative example having no vibration adjusting member 122, the peak of the vibration transmissibility at the resonance frequency fr of the sensor assembly 110 is relatively low, and the base of the peak is relatively wide, and the vibration transmissibility is relatively low in the base. It shows a very high value. Therefore, in the comparative example, it is difficult to obtain an anti-vibration effect in a band having a relatively low frequency among the frequency bands used by the sensor 111 for the detection signal, and the noise is included in the detection signal by being superimposed on the detection signal. The biological signal may be buried in the noise.

  On the other hand, as shown by the solid line in FIG. 6, in the present embodiment in which the vibration adjusting member 122 is added in series with the elastic member 121, the vibration at the resonance frequency fr of the sensor assembly 110 is added to the configuration of the comparative example. As the peak of the transmissivity becomes higher (sharp), the skirt portion of the peak narrows, and the vibration transmissibility decreases. In other words, the vibration adjusting member 122 sharpens the peak of the vibration transmissibility at the resonance frequency fr, narrows the skirt portion of the peak, and reduces the vibration transmissibility at the skirt portion, as compared with the case where the vibration adjusting member 122 is not provided. Is decreasing.

  Therefore, in the present embodiment, it is possible to obtain a greater anti-vibration effect than in the comparative example in a band where the frequency is relatively low among the used frequency bands of the detection signal. In other words, it becomes easier to expand the region where the vibration isolation effect is obtained in the used frequency band of the detection signal to a lower frequency side. Therefore, according to the present embodiment, the influence of the resonance of the sensor assembly 110 on the detection signal from the sensor 111 can be reduced.

  Further, as shown in FIG. 5, the MCU 113 has, for example, a filter unit 113a, a processing unit 113b, and the like. Then, in the present embodiment, the filter unit 113a executes a filter process of cutting off a frequency band lower than the used frequency band (near the resonance frequency fr) in the detection signal acquired from the sensor 111. The filter unit 113a is an example of a high-pass filter. Note that the filter unit 113a is not limited to this example, and may be, for example, a bandpass filter, a bandstop filter, or the like.

  Further, the processing unit 113b extracts a biological signal indicating biological information from the detection signal of the used frequency band that has passed through the filter unit 113a, and controls each unit of the vehicle 1 according to the extraction result. Executes processing for providing various services. For example, if the mood of the living body is estimated based on the biological signal when the vehicle 1 is running, it is effective to enhance the comfort of the vehicle 1 such as playing various music in accordance with the mood of the occupant in the vehicle 1. It is possible to provide the first service.

  Further, if the existence of the living body is confirmed based on the biological signal when the vehicle 1 starts moving, the effect of improving the accuracy of the seat belt reminder, such as executing the seat belt reminder only for the seat for which the presence of the living body is confirmed, is effective. It is possible to provide an efficient second service. Further, if the presence of the living body is confirmed based on the biological signal when the occupant is not present in the vehicle 1 during parking or the like, an alarm is output when an intruder is detected, which is effective for enhancing security. It is possible to provide a third service. In addition, the service using the biometric sensor unit 100 is not limited to this example.

  As described above, in the present embodiment, for example, the biological sensor unit 100 (vehicle-mounted sensor device) is interposed in the sensor assembly 110 having the sensor 111 and the vibration transmission path between the vehicle body 2 and the sensor assembly 110, The elastic member 121 is provided in series with the elastic member 121 to further increase the vibration transmissibility of the sensor assembly 110 at the time of resonance, and to increase the vibration transmissibility of the detection signal from the sensor 111 higher than the resonance frequency of the sensor assembly 110 in the use frequency band. And a supporting portion 120 having a vibration adjusting member 122 for reducing the vibration.

  According to such a configuration, for example, as compared with the case where the vibration adjusting member 122 is not provided, the peak of the vibration transmissivity at the resonance frequency fr of the sensor assembly 110 is made higher (sharp), and the foot portion of the vibration transmissibility is reduced. And the vibration transmissibility in the foot portion can be reduced. Therefore, the influence of the resonance of the sensor assembly 110 on the detection signal by the sensor 111 can be reduced.

  In the present embodiment, for example, the biological sensor unit 100 includes the casing 125 that houses the sensor assembly 110 and is fixed to the ceiling 500 of the vehicle body 2. The elastic member 121 and the vibration adjustment member 122 are disposed inside the casing 125. It is interposed between the casing 125 and the sensor assembly 110. According to such a configuration, for example, the elastic member 121 and the vibration adjusting member 122 can be protected by the casing 125.

  Further, in the present embodiment, for example, the sensor assembly 110 includes the filter unit 113a that performs a filter process of blocking a frequency band lower than the used frequency band of the detection signal. According to such a configuration, for example, the filter unit 113a attenuates and blocks the detection signal from the sensor 111 in a lower frequency band (resonance frequency fr) than the use frequency band, and detects the detection signal from the sensor 111 in the use frequency band. Can only pass through.

[First Modification]
FIG. 7 is a cross-sectional view of a biological sensor unit 100A of the present modification. The biological sensor unit 100A has the same configuration as the biological sensor unit 100 of the above embodiment. Therefore, the biological sensor unit 100A can obtain the same operation and effect as the above embodiment based on the similar configuration.

  However, this modified example is different from the above-described embodiment in that the elastic member 121A is coated with the coating type vibration damping material 123 as shown in FIG. The coating type vibration damping material 123 can be made of, for example, an acrylic resin, a material similar to the vibration adjusting member 122, or the like. The coating type vibration damping material 123 has a function of attenuating or amplifying vibration at various frequencies transmitted from the ceiling 500 to the sensor assembly 110.

  The application type vibration damping material 123 may be provided on all of the plurality of elastic members 121A, or may be provided on only one of the elastic members 121A. Further, the application type vibration damping material 123 may be applied over the entire area of the elastic member 121A, or may be applied partially.

  As described above, according to the present modification, since the coating type vibration damping material 123 is applied to the elastic member 121A, for example, noise and vibration of the elastic member 121A at the time of resonance of the sensor assembly 110 can be suppressed. it can.

[Second Modification]
FIG. 8 is a cross-sectional view of a biosensor unit 100B of the present modification. The biological sensor unit 100B has the same configuration as the biological sensor unit 100 of the above embodiment. Therefore, the biological sensor unit 100B can obtain the same operation and effect as the above-described embodiment based on the similar configuration.

  However, this modified example is different from the above-described embodiment in that a mounting member 114 is provided between an elastic member 121 and a vibration adjusting member 122 as shown in FIG. The attachment member 114 is formed, for example, in a rectangular plate shape extending along the substrate 112.

  The mounting member 114 is overlaid on the surface of the vibration adjusting member 122 on the side opposite to the substrate 112, and is fixed together with the substrate 112 and the vibration adjusting member 122 by screwing, bonding, or the like. The mounting member 114, together with the elastic member 121 and the vibration adjusting member 122, is interposed in series in a vibration transmission path between the ceiling 500 and the sensor assembly 110.

  As described above, according to this modification, since the attachment member 114 is provided, for example, the hooked portion 124 (hook receiving member) on which the elastic member 121 is hooked can be easily attached by the attachment member 114. Therefore, according to this modification, for example, the labor required for manufacturing the biological sensor unit 100B can be easily reduced. The attachment member 114 can also be referred to as an intervening member or the like. The attachment member 114 may be, for example, a board (interposer board) or the like.

[Third Modification]
FIG. 9 is a cross-sectional view of a biological sensor unit 100C of the present modification. The biological sensor unit 100C has the same configuration as the biological sensor unit 100B of the second modification. Therefore, the biological sensor unit 100C can obtain the same operation and effect as the second modification based on the same configuration.

  However, in the present modified example, as shown in FIG. 9, the point that the vibration adjusting member 122 and the mounting member 114A are provided below the substrate 112, that is, on the side of the detection target (the occupant of the vehicle 1) is the above-described second example. This is different from the modification. Specifically, the vibration adjusting member 122 is provided between the lower surface 112a of the substrate 112 and the upper surface of the mounting member 114A, and is fixed together with the substrate 112 and the mounting member 114A by screwing or bonding.

  According to this modification, since the communication module 111a and the vibration adjusting member 122 are provided on the lower surface 112a of the substrate 112, for example, the sensor assembly 110 and thus the biological sensor unit 100C are mounted in the vehicle vertical direction (Z direction), It can be made smaller in the thickness direction of 112.

  Further, the mounting member 114A is provided with a protruding portion 114t that protrudes from the substrate 112 in the vehicle width direction (Y direction). In the present modified example, a hooked portion 124 (hook fitting) on which the elastic member 121 is hooked is provided on the protrusion 114t. Further, an opening 114r for exposing the communication module 111a of the sensor 111 is provided at the center of the mounting member 114A. Therefore, the communication module 111a can transmit and receive electromagnetic waves, ultrasonic waves, and the like via the opening 114a.

[Fourth Modification]
FIG. 10 is a cross-sectional view of a biological sensor unit 100D according to the present modification. The biological sensor unit 100D has the same configuration as the biological sensor unit 100 of the above embodiment. Therefore, the biological sensor unit 100D can obtain the same operation and effect as in the above embodiment based on the similar configuration.

  However, this modified example is different from the above-described embodiment in that a wiring member 115 is provided in a casing 125 as shown in FIG. In this modified example, electric power is supplied to the sensor assembly 110 from a vibration power generation element (not shown) attached to the casing 125 or a battery of the vehicle 1 via the wiring member 115.

  The wiring member 115 has flexibility, for example, and is accommodated in the casing 125 so as to bend at at least one bent portion 115a and change the bent shape of the bent portion 115a. Accordingly, the stress generated at the connection portion of the wiring member 115 due to the displacement of the sensor assembly 110 is suppressed, and the influence of the spring constant on the spring mass system including the sensor assembly 110 and the elastic member 121 is suppressed.

[Fifth Modification]
FIG. 11 is a cross-sectional view of a biological sensor unit 100E of the present modification. The biosensor unit 100E has the same configuration as the biosensor unit 100 of the fourth modification. Therefore, the biological sensor unit 100E can obtain the same operation and effect as those of the fourth modification based on the same configuration.

  However, this modified example is different from the fourth modified example in that electric power is supplied to the sensor assembly 110 by wireless power transmission as shown in FIG. In this modification, the power transmission unit 116 and the power reception unit 117 are provided on the inner surface of the casing 125 and the upper surface 112b of the substrate 112 in a state where they face each other.

  The wireless power transmission is, for example, an electromagnetic induction method, a magnetic field resonance method, a radio wave reception method, an electric field coupling method, a DC resonance method, wireless power supply using light, or the like. As described above, according to the present modification, since power can be supplied to the sensor assembly 110 by wireless power transmission, for example, the labor required for manufacturing (wiring work) the biological sensor unit 100E can be easily reduced.

[Sixth Modification]
FIG. 12 is a cross-sectional view of a biosensor unit 100F of the present modification. The biological sensor unit 100F has the same configuration as the biological sensor unit 100 of the above embodiment. Therefore, the biological sensor unit 100F can obtain the same operation and effect as the above-described embodiment based on the similar configuration.

  However, the present modified example is different from the above embodiment in that the biological sensor unit 100F is attached to the seat frame 600 of the vehicle 1 as shown in FIG. In the present modification, the biological sensor unit 100F is housed in a seat back of a seat, for example. The board 112 is supported by the casing 125 via the support 120 in a posture crossing the vehicle front-rear direction (X direction).

  In this modification, the communication module 111a is provided on the front surface 112c on the detection target (occupant sitting on the seat) side of the board 112. Note that the present invention is not limited to this example, and the communication module 111a may be provided on the rear surface 112d of the board 112, and the occupant sitting in the rear seat of the seat may be detected.

  Further, the vibration adjusting member 122 is interposed in series with the elastic member 121 in a vibration transmission path between the seat frame 600 and the sensor assembly 110. Therefore, also in the present modification, the vibration adjusting member 122 attenuates or amplifies vibrations at various frequencies transmitted from the seat frame 600 to the sensor assembly 110, and thus influences the resonance of the sensor assembly 110 on the detection signal of the sensor 111. Can be reduced.

  As mentioned above, although the embodiment and the modification of the present invention were illustrated, the above-mentioned embodiment and the modification are examples, and are not intended to limit the scope of the invention. The above embodiments and modifications can be implemented in other various forms, and various omissions, replacements, combinations, and changes can be made without departing from the spirit of the invention. In addition, the specifications (structure, type, direction, type, size, length, width, thickness, height, number, arrangement, position, material, etc.) of each configuration, shape, etc. may be changed as appropriate. Can be implemented.

  For example, the in-vehicle sensor device is not limited to the biological sensor unit, and may be configured as a distance measuring sensor unit, a steering angle sensor unit, a wheel speed sensor unit, or the like.

  2 ... body, 100, 100A to 100F ... biological sensor unit (vehicle sensor device), 110 ... sensor assembly, 111 ... sensor, 113a ... filter section, 120 ... support section, 121, 121A ... elastic member, 122 ... vibration adjustment member Reference numeral 123 denotes a coating type vibration damping material, and 125 denotes a casing.

Claims (4)

A sensor assembly having a sensor;
An elastic member, which is interposed in a vibration transmission path between the vehicle body and the sensor assembly and is provided in series with the elastic member, further increases the vibration transmission rate at the time of resonance of the sensor assembly and increases the vibration transmission rate of the sensor assembly. A vibration adjusting member that reduces the vibration transmissibility in the use frequency band of the detection signal by the high sensor,
In-vehicle sensor device equipped with A casing that houses the sensor assembly and is fixed to the vehicle body;
The in-vehicle sensor device according to claim 1, wherein the elastic member and the vibration adjusting member are interposed between the casing and the sensor assembly in the casing.   The on-vehicle sensor device according to claim 1, further comprising: a coating type vibration damping material applied to the elastic member.   The on-vehicle sensor device according to any one of claims 1 to 3, wherein the sensor assembly has a filter unit that performs a filter process for blocking a frequency band lower than a frequency band used by the detection signal.

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