JP2010285094A - Mounting structure of article detecting unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress erroneous detection by suppressing irradiation of the outside of the detection target with transmitted radio waves. <P>SOLUTION: An article detecting unit 7 for detecting an intruder into a vehicle cabin is mounted in the inside of a door 3. The article detecting unit 7 includes a housing 15 storing a circuit substrate 11 equipped with a transmitting part, a receiving part, and a control part. The housing 15 includes a metallic plate 9 to which the circuit substrate 11 is mounted, and a cover 13 mounted to the metallic plate 9 so as to cover the circuit substrate 11. The metallic plate 9 includes a body part 17 fixed to an inner surface of a door 5, and a bending part 19 bending from the periphery of the body part 17 toward the vehicle cabin side. At a part (19a) corresponding to a vehicle body rear side of the bending part 19, a notch part 19a1 for avoiding a connector 31 mounted on the circuit substrate 11 is provided. The notch part 19a1 opposes to a vehicle body panel 33 positioned on a vehicle body rear side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an attachment structure for an object detection unit mounted on a vehicle.

  Conventionally, an intrusion detection system that detects an intrusion of a person into a vehicle is known (see, for example, Patent Document 1 below). This intrusion detection system uses a radio wave sensor and determines the presence or absence of an intruder based on the received electric field strength of the transmitted radio wave.

JP 2008-1000060 A

  By the way, a radio wave sensor that detects an intruder in the vehicle detects an object outside the vehicle when the transmitted radio wave is emitted toward the outside of the vehicle, so even if no intruder enters the vehicle, There is a risk of false detection due to reaction. For this reason, it is necessary to suppress the emission of the radio wave outside the detection target by radiating the transmitted radio wave only to the inside of the vehicle that is the detection target as much as possible.

  Therefore, an object of the present invention is to suppress erroneous detection by suppressing radiation of a transmitted radio wave to the outside of the detection target.

  In the present invention, the housing of the object detection unit attached to the inside of the vehicle body includes a radio wave shielding member that shields at least the side opposite to the passenger compartment in the transmission direction of the radio wave transmitted from the object detection unit to the surroundings. One component of the vehicle body that can shield radio waves is located at a position facing a part of the housing that is not shielded by radio waves.

  According to the present invention, even if a part of the housing that is not shielded by the radio wave shielding member is in a position corresponding to the outside of the detection target, the radio wave radiated through a part of the housing corresponding to the outside of the detection target Since it can be shielded by one structural member of the vehicle body, it is possible to suppress erroneous detection by suppressing the radiation of the transmitted radio wave to the outside of the detection target.

It is the side view which abbreviate | omitted a part of vehicle body which shows the 1st Embodiment of this invention. It is a perspective view of the object detection unit attached to the vehicle body of FIG. It is a functional block diagram of the object detection unit of FIG. It is a model diagram which shows the radio wave transmission area from a transmission part. It is a typical top view which shows the electromagnetic wave transmission area from the transmission part in the object detection unit of FIG. It is a typical top view at the time of attaching an object detection unit to four doors of a vehicle body. FIG. 6 is a plan view corresponding to FIG. 5, showing a radio wave transmission area from a transmission unit according to the second embodiment of the present invention.

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

[First Embodiment]
As shown in FIG. 1, an object detection unit 7 is attached to the inner side of a door 3 as an inner side of a vehicle body 1 in an automobile, that is, on the side of a compartment 6 of a door inner panel 5 (see FIG. 5). The object detection unit 7 is covered with an interior material provided on the surface of the door inner panel 5 although not particularly shown. Further, the direction indicated by the arrow FR in FIG. 1 corresponds to the front of the vehicle body.

  As shown in FIG. 2, the object detection unit 7 has a circuit board 11 serving as a sensor unit serving as an object detection unit on the back side of the sheet of FIG. 2 of the metal plate 9 serving as a radio wave shielding member. A resin cover 13 is provided on the side opposite to the metal plate 9 so as to cover the circuit board 11. The resin cover 13 and the metal plate 9 constitute a housing 15, and the metal plate 9 is located outside the vehicle body with respect to the cover 13. The cover 13 is attached to the metal plate 9 by fitting a fitting claw provided on the cover 13 into a fitting hole provided on the metal plate 9, or is fastened and fixed using a fastener such as a screw.

  The metal plate 9 has a flat plate-like main body portion 17 covering the outer side of the vehicle body of the circuit board 11 and the inner periphery of the main body portion 17 from the outer peripheral end portion excluding the portion corresponding to the lower side of the vehicle body indicated by the arrow A in FIG. It has the bending part 19 (19a, 19b, 19c) bent toward the direction. Here, the bent portion 19a corresponds to the rear of the vehicle body, the bent portion 19b corresponds to the front of the vehicle body, and the bent portion 19c corresponds to the upper portion of the vehicle body.

  A mounting piece 21 that protrudes toward the lower side of the vehicle body is provided at approximately the center in the vehicle width direction of the portion corresponding to the lower side of the vehicle body that does not include the bent portion 19 of the main body portion 17, and a mounting hole 21 a formed in the mounting piece 21. The object detection unit 7 is attached to the door inner panel 5 by inserting a screw from the vehicle compartment 6 side into a long hole 17 a provided on the vehicle body upper side opposite to the attachment piece 21 in the main body portion 17.

  As shown in FIG. 3, the circuit board 11 described above includes, for example, a transmission unit 23 that transmits a microwave as a radio wave, a reception unit 25 that receives a reflected wave of a radio wave transmitted from the transmission unit 23, the transmission unit 23 and the reception unit. An electronic control unit (ECU) 27 that is a control unit connected to 25 is mainly provided.

  The ECU 27 is also connected with an alarm device 29 installed at an appropriate part of the vehicle. The alarm device 29 is composed of, for example, a speaker or a display. When the ECU 27 determines that an intruder has entered the passenger compartment 6, the alarm device 29 is activated to intimidate the intruder or people around the vehicle. Raising attention to

  Such an object detection unit 7 uses a radio wave sensor using the Doppler effect, the radio wave transmitted from the transmission unit 23 is reflected on an object (intruder), and the reception unit 25 receives the reflected wave, The ECU 27 determines the presence or absence of the object (intruder) based on the phase of the received wave.

  Further, the circuit board 11 is provided with a connector 31 for connecting a power supply and input / output signal wiring 30. The connector 31 is located behind the vehicle body of the object detection unit 7 in FIG. 1 (rightward direction in FIG. 1). ) And facing the metal body panel 33 extending in the vertical direction. The vehicle body panel 33 includes a front surface 33a that faces the front of the vehicle body, and constitutes a constituent member of the vehicle body.

  Here, in order to prevent the connector 31 attached to the circuit board 11 from interfering with the bent portion 19a of the metal plate 9, the bent portion 19a is formed with a notch 19a1 serving as a wiring lead-out portion. Therefore, the notch 19a1 is also formed at a position facing the vehicle body panel 33 as in the case of the connector 31.

  As described above, the metal plate 9 functions as a radio wave shielding member. However, as shown in FIG. 4, when the metal plate 9 is not considered, the metal plate 9 is transmitted from the transmission unit 23 provided substantially at the center of the circuit board 11. The radio wave radiation area (detection area) is substantially spherical with the transmitter 23 as the center, as indicated by the hatched portion B. On the other hand, the radiation area (detection area) of the radio wave in the present embodiment provided with the metal plate 9 is a plan view as viewed from the vertical direction of the vehicle body as shown in FIG. Then, the area is indicated by the hatched portion C.

  The object detection unit 7 shown in FIG. 2 is attached to the inside of the door 3 on the left side of the vehicle body (corresponding to the front side in FIG. 1) as shown in FIG. 1) is attached to the object detection unit 7 shown in FIG. 2 with the left and right structures being reversed. That is, when the metal plate is attached to the inner panel of the right side door of the vehicle body, the bent portion 19a including the notch portion 19a1 and the connector 31 are located on the rear side of the vehicle body as in FIG. This notch portion 19a1 faces a vehicle body panel similar to that shown in FIG. 1 located behind the vehicle body.

  Next, the operation will be described. When the occupant gets off and the door is closed and locked while the vehicle is stopped, the ECU 27 starts detecting the intruder into the passenger compartment 6. That is, after a radio wave is transmitted from the transmitter 23 to the surroundings, the radiation area (detection area) is regulated by the metal plate 9 so as to be substantially on the vehicle compartment 6 side as shown in FIG.

  Therefore, for example, when a person breaks into the vehicle compartment 6 by breaking the window glass of the vehicle, the intruder interferes with the radio wave radiation area indicated by the hatched portion C, so that the ECU 27 Is determined to have entered the passenger compartment 6.

  The radiation area indicated by the hatched portion C is the same for the object detection unit attached to the door on the right side of the vehicle body. Therefore, the left and right object detection units radiate radio waves almost throughout the vehicle interior 6.

  Here, as shown in FIG. 2, in this embodiment, a metal plate 9 that shields radio waves is used in a part of the housing 15. As shown in FIG. 5, the metal plate 9 covers the outside of the vehicle body with respect to the circuit board 11 on the side that transmits radio waves by the main body portion 17, and thus shields the emission of radio waves to the outside of the vehicle. Thus, erroneous detection due to reaction in a state where no intruder enters the passenger compartment 6 is suppressed.

  Further, the metal plate 9 described above is provided with a bent portion 19 (19a, 19b, 19c) around the bottom of the vehicle body indicated by an arrow A in FIG. 2 to shield radio waves transmitted from the circuit board 11 side. . For this reason, it is possible to suppress detection of an object outside the vehicle in the longitudinal direction of the vehicle body or above the vehicle body, and it is possible to suppress erroneous detection due to reaction in a state where no intruder enters the vehicle interior 6.

  Here, in this embodiment, the notch 19a1 is formed in the bent portion 19a on the rear side of the vehicle body of the metal plate 9 due to the presence of the connector 31 attached to the circuit board 11. For this reason, the component which goes to the vehicle body rear side among the radio waves transmitted to the surroundings from the transmission unit 23 of the circuit board 11 has a cutout portion 19a1 with respect to the region corresponding to the protruding height inward in the vehicle width direction of the bent portion 19a. Will leak to the rear of the vehicle.

  However, in the present embodiment, the above-described notch 19a1 is located at a position facing the vehicle body panel 33 of the vehicle body 1 shown in FIG. Leakage of radio waves from the notch 19a1 to the rear of the vehicle body can be suppressed. Thereby, it can contribute to the false detection suppression by the object detection unit 7 reacting in the state where the intruder into the vehicle interior 6 is not generated.

  In FIG. 1, the object detection unit 7 is attached to the inside of the left and right doors 3 for a two-door vehicle in which the doors 3 are set only at positions corresponding to the driver seat and the passenger seat. The object detection unit 7 may be attached to the inside of the vehicle body panel 35 behind the vehicle body with respect to the door 3. Thereby, the wider range in the vehicle interior 6 can be made into a detection area, and the intruder into the vehicle interior 6 can be detected more reliably.

  The object detection unit 7 attached to the vehicle body panel 35 has a structure in which the notch 19a1 provided in the bent portion 19 of the metal plate 9 faces the rear surface on the vehicle body rear side opposite to the front surface 33a of the vehicle body panel 33 shown in FIG. It will be a thing.

  FIG. 6 shows an example in which the object detection unit 7 is attached to the front, rear, left and right four doors 3 of the vehicle body 10 in a four-door vehicle different from FIG. 1. The radio wave radiation area of each object detection unit 7 is as follows. As indicated by the hatched portion D, it is directed into the passenger compartment 6.

  In this example, the side of the vehicle body between the front and rear doors 3 is provided with a pillar 37 extending as a constituent member of the vehicle body 10 in the vertical direction of the vehicle body. The pillar 37 is shown in FIG. The notched portion 19a1 of the bent portion 19a is opposed to the bent portion 19a.

  Therefore, in the example shown in FIG. 6, the radio wave leaking from the notch 19a1 to the rear or front of the vehicle body is shielded by the front surface of the pillar 37 or the rear surface of the vehicle body. It is possible to contribute to suppression of erroneous detection by reacting in a state where no intruder enters the passenger compartment 6.

  Such object detection units 7 attached to the vehicle bodies 1 and 10 are such that the connector 31 and the cutout portion 19a1 shown in FIG. 2 are positioned to face each other along the vehicle body longitudinal direction with respect to the vehicle body panel 33 and the pillar 37. Structure.

  Thus, according to the present embodiment, even if a part of the housing 15 that is not shielded by the metal plate 9 is in a position corresponding to the outside of the detection target, the body panel 33 and the pillar 37 can shield the radio wave. Therefore, it is possible to suppress erroneous detection by suppressing the emission of the transmitted radio wave to the outside of the detection target. At this time, it is not necessary to provide a separate member for shielding dedicated radio waves, so that an increase in cost can be suppressed.

[Second Embodiment]
FIG. 7 includes a metal plate 90 instead of the metal plate 9 in the first embodiment. The metal plate 90 is simply a flat plate shape and does not include the bent portion 19 as in the metal plate 9. Therefore, the radiation area (detection area) of the radio wave transmitted from the transmission unit 23 in this case includes an area blocked by the bent portion 19 of FIG. 5 as shown by the hatched portion E. In the case of FIG. As compared with the case, the side closer to the outside of the vehicle interior in the passenger compartment 6 is included.

  In the second embodiment, the metal plate 90 is attached to the inner side of the inner panel 5 in the door 3 in the same manner as the metal plate 9 in FIG. Radio waves leaking forward of the vehicle body can be shielded by the vehicle body panel 33 or the pillars 37 as in the first embodiment.

  Thus, also in the second embodiment, it is possible to contribute to suppression of erroneous detection due to the object detection unit 7 reacting in a state where no intruder has entered the passenger compartment 6.

  In the first embodiment, as compared with the second embodiment, shielding against radio wave radiation to an area that does not require detection is effective because the bent portion 19 is provided.

  In the present invention, a part of the housing that is not shielded by the radio wave shielding member is located at a position corresponding to the wiring lead-out portion provided in the radio wave shielding member for drawing the wiring connected to the object detection unit to the outside. The object detection unit is attached to the inside of the vehicle body so that one component of the vehicle body is located at a position facing the wiring lead-out part.

  For this reason, by forming the wiring lead part on the radio wave shielding member of the housing, even if the radio wave leaks from the wiring lead part, the leaked radio wave can be shielded by one component member of the vehicle body.

  In the present invention, one structural member of the vehicle body that can shield radio waves is a pillar that extends in the vertical direction of the vehicle body. For this reason, even if a radio wave leaks from the wiring lead portion, the leaked radio wave can be shielded by the pillar.

  Furthermore, in the present invention, the radio wave shielding member has a main body that covers the opposite side of the object detection unit from the vehicle interior, and a bent portion that is bent from the outer peripheral end of the main body toward the vehicle interior. A wiring lead portion is provided at the bent portion. For this reason, when a radio wave is shielded by providing a bent portion on a metal plate, even if the radio wave leaks from the wiring lead-out portion provided on the bent portion, the leaked radio wave is shielded by one component of the vehicle body. , False detection can be suppressed.

1,10 Car body 6 Car compartment 7 Object detection unit 5 Door inner panel (inside the car body)
9 Metal plate (Radio wave shielding member)
11 Circuit board (object detection unit)
15 Housing 17 Metal plate body 19 Metal plate bent portion 19 a 1 Notch portion provided in bend (wiring lead-out portion)
30 Wiring 33 Car body panel (one component of the car body)
37 pillar (one component of the car body)

Claims (4)

  An object detection unit mounting structure in which an object detection unit including an object detection unit that receives an electromagnetic wave to be transmitted and detects an object and a housing that accommodates the object detection unit is attached to the inside of a vehicle body, and the housing includes: A radio wave shielding member that shields at least the side opposite to the passenger compartment in the transmission direction of radio waves transmitted from the object detection unit to the surroundings, and faces a part of the housing that is not shielded by the radio wave shielding member. An object detection unit mounting structure, wherein the object detection unit is mounted inside the vehicle body so that one component of the vehicle body capable of shielding the radio wave is located at a position where the radio wave is shielded.   A part of the housing that is not shielded by the radio wave shielding member is located at a position corresponding to a wiring lead portion provided in the radio wave shielding member for drawing the wiring connected to the object detection unit to the outside. The object detection unit mounting structure according to claim 1, wherein the object detection unit is mounted inside the vehicle body such that one component of the vehicle body is positioned at a position facing the portion.   3. The object detection unit mounting structure according to claim 1, wherein one component of the vehicle body is a pillar extending in a vertical direction of the vehicle body. 4.   The radio wave shielding member has a main body that covers the opposite side of the object detection unit from the passenger compartment, and a bent portion that bends from the outer peripheral end of the main body toward the passenger compartment. 4. The object detection unit mounting structure according to claim 2, further comprising a wiring lead portion.

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