JP2013221901A - Vehicle intrusion detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constantly and accurately detect intrusion while coping with variation in an output state of ultrasound wave emission means T due to age deterioration.SOLUTION: An ultrasound wave is emitted into a cabin from the ultrasound emission means T, while an ultrasound wave reflected in the cabin is received by ultrasound detection means R. The ultrasound wave emission is composed of a main beam M propagating toward a rear side and a side robe SR propagating toward a driver seat door 25. According to receiving intensity difference of the ultrasound receiving means R between when the driver seat door 25 is opened and when it is closed, an output state of the ultrasound emission means T is corrected (for example, frequency correction).

Description

  The present invention relates to an intrusion detection apparatus for an automobile that detects entry into a vehicle interior using ultrasonic waves.

  In order to detect (detect) intrusion into the vehicle interior, ultrasonic waves are transmitted from the ultrasonic transmission means to the vehicle interior, and ultrasonic waves transmitted to the vehicle interior are received by the ultrasonic reception means. . In particular, it can be detected that there is a moving object in the passenger compartment due to a change in the reception state. That is, for example, when a thief puts a hand in the vehicle compartment or enters the whole body, there is a considerable movement in the vehicle interior, and the reception state of ultrasonic waves by the receiving means is changed, and there is a risk of theft Can be detected.

  Patent Document 1 discloses a sensor unit having ultrasonic transmission means and ultrasonic reception means disposed on the front end side of a roof portion. In addition, the ultrasonic transmission means and the ultrasonic reception means are often covered from the vehicle interior by a cover member in order to improve the appearance from the vehicle interior, and in this case, an opening through which the ultrasonic wave is passed through the cover member Will be formed.

JP 2003-237540 A

  By the way, the output state of the ultrasonic wave transmitted by the ultrasonic wave transmitting means, in particular, the frequency is often changed due to, for example, individual differences of the ultrasonic wave transmitting element, temperature change, secular change and the like. If the output state of the transmitted ultrasonic wave changes, the accuracy of intrusion detection is deteriorated. Therefore, some countermeasure is desired in this respect.

  In particular, in addition to the main beam, there may be a case where a side lobe heading in a direction different from the main beam is transmitted from the ultrasonic transmission means. In this case, the side lobe is set so that complicated factors such as reflection, diffraction, interference, and the like are intertwined and set in a predetermined direction with a predetermined intensity, while a frequency change causes a large change in the intensity and direction of the side lobe. .

  The present invention has been made in view of the above circumstances, and the purpose of the present invention is to make it possible to always perform intrusion detection accurately in response to changes in the output state of the ultrasonic transmission means. To provide an apparatus.

  In order to achieve the above object, in the present invention, basically, reception by the ultrasonic receiving means is performed when the open / close body such as the side door that defines the vehicle interior space is open or closed. Focusing on the change in intensity, the output state of the ultrasonic wave transmitting means, particularly the frequency, is corrected in accordance with the change in the received intensity.

Specifically, the following solution is adopted in the present invention. That is, as described in claim 1,
In an intrusion detection apparatus for an automobile that detects ultrasonic waves transmitted from an ultrasonic transmission means toward a vehicle interior space by an ultrasonic reception means and detects intrusion into the vehicle interior,
An opening degree detecting means for detecting the opening degree of the opening and closing body defining the vehicle interior space;
Receiving intensity detecting means for detecting the receiving intensity at the ultrasonic receiving means for each different opening of the opening / closing body detected by the opening detecting means,
Correction means for correcting an ultrasonic wave transmission state in the ultrasonic wave transmission means based on a difference in reception intensity at different opening degrees of the opening / closing body detected by the reception intensity detection means;
It is supposed to be equipped with.

  According to the above solution, intrusion detection is always performed accurately with the output state of the ultrasonic transmission means always appropriate in response to various factors such as individual differences of the ultrasonic transmission means, temperature change, aging, etc. be able to.

A preferred mode based on the above solution is as described in claim 2 and the following claims. That is,
In addition to transmitting the main beam, the ultrasonic transmission means is set to transmit a side lobe so as to supplement a detection region by the main beam,
The opening / closing body is an opening / closing body in a position where the side lobe reflects.
(Corresponding to claim 2). In this case, it is possible to always make the output state of the ultrasonic wave transmitting means appropriate by looking at the change in the reception intensity caused by the side lobe according to the difference in the opening degree of the side door.

Each of the ultrasonic wave transmitting means and the ultrasonic wave receiving means is disposed at a high place at a substantially front end in a vehicle interior,
The main beam is set to face diagonally downward,
The side lob is set to face the side door,
The opening and closing body is the side door;
(Corresponding to claim 3). In this case, what is preferable in terms of implementation is provided while the effect corresponding to claim 2 is obtained. In particular, the ultrasonic transmission means and the ultrasonic reception means can be arranged using the upper space in the vehicle interior effectively.

  The height is configured as a roof portion (corresponding to claim 4). In this case, an ultrasonic transmission means and an ultrasonic reception means can be arranged using the loop portion.

The main beam transmitted by the ultrasonic transmission means is set to face the rear gate located at the rear end of the vehicle,
The opening and closing body is the rear gate;
(Corresponding to claim 5). In this case, the effect corresponding to claim 1 can be obtained by effectively using the main beam and the rear gate.

  The correction means corrects the frequency of the ultrasonic wave transmitted by the ultrasonic wave transmission means (corresponding to claim 6). In this case, the frequency of the ultrasonic wave transmitted from the ultrasonic wave transmitting means that has a great influence on the detection accuracy is always appropriate, which is extremely preferable in always performing the intrusion accuracy with high accuracy.

  According to the present invention, intrusion detection can always be performed with high accuracy.

1 is a simplified side view illustrating an example of a vehicle to which the present invention is applied. The principal part perspective view which looked at the unit body and the cover member of the ultrasonic transmission means and ultrasonic reception means which were provided in the roof part front end part from the back lower part. The disassembled perspective view of the unit body and cover member of FIG. The block diagram which shows the example of a control system for theft prevention using an ultrasonic sensor apparatus. The simplified top view which shows the example of a setting of a detection area. FIG. 6 is a simplified plan sectional view showing an example for obtaining the detection area of FIG. 5. The simplified top view which shows another example of a setting of a detection area. The simplified plane sectional view showing an example for obtaining the detection area of FIG. FIG. 8 is a simplified plan sectional view showing another example for obtaining the detection area of FIG. 7. FIG. 8 is a simplified plan cross-sectional view showing still another example for obtaining the detection area of FIG. 7. The simplified top view which shows the example which improves detection accuracy using opening and closing of a side door. The simplified top view which shows the example which improves detection accuracy using opening and closing of a rear gate. The flowchart which shows the example of control of this invention. The side view which shows the example which provided the cone. The front view seen from the opening edge part side of a cone which shows another example of a cone. The top view of FIG.

  In FIG. 1, V is a vehicle to which the present invention is applied. The vehicle V is a wagon type automobile in the embodiment, but is a sedan type, a two-door type, a one-box type, a bus, a truck, etc. The form of the vehicle V is not particularly limited.

  The ultrasonic transmission means T and the ultrasonic reception means R are arranged close to each other at the middle in the left-right direction (vehicle width direction) of the front end height (in the embodiment, the roof portion) in the vehicle V cabin. Has been. A detection area A by the ultrasonic transmission means T and the ultrasonic reception means R is indicated by hatching. This detection area A corresponds to the main beam M, and is almost the entire range in the front-rear direction of the passenger compartment. Then, in the plan view seen from above, the detection area A is left and right as shown in FIG. Also set to spread.

  As shown in FIG. 3, the ultrasonic transmission means T and the ultrasonic reception means R are incorporated in a unit body U fixed to the roof portion at the front end of the vehicle interior, and the state of incorporation into the vehicle body is shown in FIG. . The unit body U includes a sensor unit 1, a mounting member 2, and a cover member 3. The sensor unit 1 is fixed to the front side of the mounting member 2. Further, the cover member 3 is fixed to the rear surface side of the attachment member 2.

  The attachment member 2 has a pair of left and right attachment hole portions 4 and 5. The ultrasonic transmitting means T (the ultrasonic transducer) connected to the sensor unit 1 is fitted and held in the mounting hole 4. Further, the ultrasonic receiving means R (the ultrasonic transducer) connected to the sensor unit 1 is fitted and held in the mounting hole 5. The ultrasonic transmission means T (ultrasonic transducer) receives a driving voltage from the sensor unit 1 and is vibrated to transmit ultrasonic waves. Further, the ultrasonic receiving means R (ultrasonic transducer) generates a voltage when receiving the ultrasonic wave, and the generated voltage is A / D converted by the sensor unit 1 to control theft prevention described later. Used as a signal.

  The cover member 3 fixed to the rear surface side of the attachment member 2 has slit-like openings 10 and 11 for passing ultrasonic waves at positions corresponding to the attachment holes 4 and 5. Further, the cover member 3 incorporates a pair of left and right passenger compartment illumination lamps 12, and this illumination lamp 12 also serves as, for example, a push-type switch. Are switched off, and the change-over switch 13 switches between three modes: always off, always lit, and lit only when the door is opened.

  FIG. 4 shows an anti-theft control system example in which the ultrasonic transmission means T and the ultrasonic reception means R are incorporated. In FIG. 4, C is a controller (control unit) configured using a microcomputer, and 20 is an alarm. The ultrasonic wave transmitted from the ultrasonic wave transmitting means T to the vehicle interior is received by the ultrasonic wave receiving means R. This reception state includes a steady state where there is no moving object in the vehicle interior and an abnormal state where there is a moving object. And is different. That is, if there is something that moves in the passenger compartment, the Doppler effect is changed as compared to the steady state, so that it can be determined that there is an abnormal state where there is a risk of theft. The controller C determines whether the state is a steady state or an abnormal state.

  If the controller C determines that the state is abnormal, the alarm device 20 is activated. As an operation of the alarm device 20, an appropriate method can be adopted as long as it is a technique for transmitting an abnormality to the surroundings. For example, an alarm sound at a large volume is generated (a speaker is used as the alarm device 20), a small alarm These may be operated in combination, such as blinking the lamp (using a vehicle width lamp as the alarm device 20). Note that it is assumed that the operating condition of the alarm device 20 is that the doors of the vehicle V are all locked.

  The controller U further receives a signal from the outside air temperature sensor 21 that detects the outside air temperature and a signal from the door opening degree sensor 22. As will be described later, the door opening sensor 22 detects, for example, the opening of a driver's seat door as a side door that defines a vehicle interior space. The door opening sensor 22 may detect only full opening and full closing of the driver's seat door. Each of the sensors 21 and 22 is used for correcting the output state of the ultrasonic transmission means T described later. The sensor unit U may have the function of the controller C so that the operation of the alarm device 20 is directly controlled by the sensor unit U, or the output state correction control of the ultrasonic transmission means T is performed. May be.

  The openings 10 and 11 formed in the cover member 3 will be described with reference to FIG. In FIG. 6, for convenience of explanation, the ultrasonic transmission means T and the opening 10 of the cover member 3 corresponding thereto are shown, but the ultrasonic reception means R is also set in the same manner (this fact) The same applies to the case where the ultrasonic transmission means T is described in the following embodiment). First, the opening 10 is disposed so as to be substantially orthogonal to the ultrasonic transmission means T (the axial line of the ultrasonic transmission means). A plurality of fin portions (rib portions) 30 are disposed in the opening portion 10 at intervals in the left-right direction. In the example of FIG. 6, each fin portion 30 has a rectangular cross section. In addition, the fin part 30 is integrally formed with the cover member 3 by synthetic resin, for example (for example, injection molding).

  The plurality of fin portions 30 extend substantially in the front-rear direction and are arranged in parallel to each other. The length of the fin portion 30 in the vertical direction (the length in the direction perpendicular to the plane of FIG. 6) is sufficiently longer than the wavelength λ of the ultrasonic wave transmitted from the ultrasonic transmission means T (for example, 20 mm to 40 mm). The frequency of the ultrasonic wave is selected from a range of 20 KHZ to 60 KHZ, for example, and is 40 KHZ in the embodiment). Further, the width of the fin portion 30 (length in the left-right direction in FIG. 6) itself is set to be less than 1/2 (λ / 2) of the wavelength λ of the ultrasonic wave.

  The ultrasonic transmission means T is disposed in proximity to the opening 10 (fin portion 30). Thereby, when viewed from the ultrasonic transmission means T, the plurality of fin portions 30 located in the left and right direction (vehicle width direction) central portion among the plurality of fin portions 30 have a projected width of less than λ / 2. It does not interfere with the passage of ultrasonic waves. That is, the ultrasonic wave transmitted from the ultrasonic transmission means T is transmitted to the rear as it is through the intermediate portion in the left-right direction of the opening 10, and this becomes the main beam M.

  On the other hand, among the plurality of fin portions 30, the specific fin portions 30L and 30R positioned at the end portions in the left-right direction are close to the ultrasonic transmission means T, and thus projected when viewed from the ultrasonic transmission means T. The width has a width of λ / 2 or more. Thereby, the ultrasonic wave transmitted from the ultrasonic wave transmitting means T is reflected by the specific fin portion 30L to form the right side lobe SR. Similarly, the ultrasonic wave transmitted from the ultrasonic wave transmitting means T is reflected by the specific fin portion 30R to form the left side lob SL. In this way, a detection area A composed of one main beam M as shown in FIG. 5 and two left and right side lobes SL and SR in a desired direction (in a side view, it is rearward and downward as shown in FIG. 1). Will be formed.

  The right side lob SL faces the driver's seat door (right-hand drive vehicle in the embodiment), and the left side lob SL faces the passenger seat door. The side lobes SL and SR are formed as a result of adding diffraction and interference while mainly reflecting ultrasonic waves. In particular, the strength and direction of the side lobes SL and SR are easily changed by a frequency change transmitted from the ultrasonic transmission means T. It is.

  The ultrasonic receiving means R and the opening 11 of the cover member 3 corresponding thereto are also set in the same manner as for the ultrasonic transmitting means T. That is, as in the case shown in FIG. 6, the opening portion 11 has a plurality of fin portions 30, and only the fin portions at the end portions in the left-right direction are specified fin portions 30 </ b> L and 30 </ b> R. That is, the ultrasonic wave incident on the opening 11 from the direction of the main beam M is transmitted forward as it is and incident (received) on the ultrasonic wave receiving means R. Further, the ultrasonic wave from the right side lobe SR direction is reflected by the left specific fin portion 30L and is incident on the ultrasonic wave receiving means R. Further, the ultrasonic wave from the left side lob SL direction is reflected by the right specific fin portion 30R and is incident on the ultrasonic wave receiving means R. In this way, the ultrasonic wave receiving means R is also preferable for improving the receiving sensitivity because the incident direction of the ultrasonic wave corresponds to the main beam M and the pair of left and right side lobes SL and SR. It becomes.

  FIG. 7 shows that the detection area is set so that the main beam M faces slightly to the left in the plan view as compared with the case of FIG. 6. The right side lob SR is set, and the left side lob SL is not set in the left direction covered by the main beam M. The right side lob SR faces the driver's seat door.

  An example of setting the detection area as shown in FIG. 7 is shown in FIG. FIG. 8 shows the ultrasonic transmission means T with attention as in the case of FIG. First, the ultrasonic transmission means T is set so that its axis is inclined with respect to the opening 10 (the ultrasonic transmission direction from the ultrasonic transmission means T is set to face the left rear. In addition, the fin part 30 set to the opening part 10 is the same as the case of FIG.

  In the example of FIG. 8, by setting the axis of the ultrasonic transmission means T to be inclined with respect to (the surface of) the opening 10, the fin at the left end of the plurality of fins 30 is a specific fin. 30L. That is, the fin portions 30 other than the specific fin portion 30L have a projection width viewed from the ultrasonic transmission means T of less than λ / 2, and the ultrasonic waves are transmitted as they are in the axial direction of the ultrasonic transmission means T. Thus, the main beam M is formed. On the other hand, in the specific fin portion 30L, the projection width when viewed from the ultrasonic transmission means T is set to λ / 2 or more, and is reflected by the specific fin portion 30L. That is, the ultrasonic wave transmitted from the ultrasonic transmission means T is reflected by the specific fin portion 30L to form the right side lob SR. Note that the fin portion of the opening 11 of the cover member 3 corresponding to the ultrasonic wave receiving means R is also the same as the above case (the ultrasonic wave from the right side lob SR direction is reflected by the specific fin portion 30L. And enters (receives) the ultrasonic wave receiving means R).

  FIG. 9 shows another example of setting the detection area as shown in FIG. In the example of FIG. 9, the axis of the ultrasonic transmission means T is orthogonal to the opening 10 (the surface thereof) (same as in FIG. 6). Moreover, the cross-sectional shape of the fin part 30 is made into the substantially elliptical shape which makes a major axis the substantially front-back direction. That is, the thicknesses of the fin portions 30 (the length in the vertical direction in FIG. 9 and the major axis direction) are equal to each other, while the minor axis is increased toward the left side, and the two fins on the left side are increased. The portion is a specific fin portion 30L that is nearly circular. That is, the projection width when viewed from the ultrasonic transmission means T is set to be λ / 2 or more in the specific fin portion 30L, and the projection width of the other fin portions 30 is less than λ / 2. Is set to

  FIG. 10 shows another example in which a detection area as shown in FIG. 7 is set. That is, the cross-sectional shape of the fin portion 30 set in the opening 10 is substantially rectangular as in the case of FIGS. Except for the specific fin portion 33L located at the left side end among the plurality of fin portions 30, the directing direction is substantially the same as the spreading direction of the ultrasonic waves transmitted from the ultrasonic transmission means T. Further, the projection width as viewed from the ultrasonic transmission means T is set to be less than λ / 2 (formation of the main beam M).

  On the other hand, the specific fin portion 33L located at the left side end is inclined so that its directing direction intersects the spreading direction of the ultrasonic waves transmitted from the ultrasonic transmission means T, as viewed from the ultrasonic transmission means T. The projection width is set to be λ / 2 or more. Thereby, the ultrasonic wave transmitted from the ultrasonic wave transmitting means T is reflected by the specific fin portion 30L to form the right side lobe SR.

  FIG. 11 shows a case in which the main beam M is directed rearward and the right side lob SR is directed toward the driver's seat door in a plan view (the state in which the left side lob SL is not present in FIG. 5 or substantially in FIG. 7). Like state). FIG. 11 shows a state where the driver's seat door 25 is open.

  When the driver's seat door 25 is closed, the right side lob SR is reflected by the driver's seat door 25, and the reception intensity at the ultrasonic receiving means R is sufficiently strong. On the other hand, when the driver's seat door 25 is open (particularly when the driver's seat door 25 is fully opened as in the fully opened state), the right side lob 2R is not reflected or hardly reflected by the driver's seat door 25. The reception intensity at the sound wave receiving means R is weakened.

  The difference in the reception intensity at the ultrasonic receiving means R between when the driver's seat door 25 is closed and when it is opened is the side lobe SR when the driver's seat door 25 requiring intrusion detection is closed. It will show the strength of. That is, when the difference is smaller than a predetermined value set in advance, the strength of the side lobe SR is weakened. When the strength of the side lobe SR is weakened, the output state of the ultrasonic transmission means T, particularly the frequency, is changed to increase the strength. This frequency change control is performed so that the difference becomes large.

  In changing the frequency of the ultrasonic wave transmitted from the ultrasonic wave transmitting means T, for example, when a desired frequency is obtained with a pulse signal, the number of pulses of the pulse signal may be changed. Further, if the ultrasonic transmission means R is of a type in which the frequency is changed according to the voltage, the drive voltage may be changed.

  FIG. 12 uses a rear gate door 26 that opens and closes the rear part of the vehicle body as an opening / closing body. That is, since the main beam M is set so as to face the rear gate door at the rear of the vehicle body, when the rear gate door 26 is opened, the main beam M is not reflected at the rear gate door 26 at all. Therefore, the reception intensity at the ultrasonic wave receiving means R becomes weak. The difference in reception intensity at the ultrasonic receiving means R between when the rear gate door 26 is closed and when it is open is the intensity of the main beam M when the rear gate door 26 that requires intrusion detection is closed. Will be shown. That is, when the difference is smaller than a predetermined value set in advance, the intensity of the main beam M is weakened. When the intensity of the main beam M is weakened, the output state of the ultrasonic transmission means T, particularly the frequency, is changed to increase the intensity. This frequency change control is performed so that the difference becomes large.

  FIG. 13 is a flowchart showing a control example of the frequency correction described above, and this flowchart will be described below. In the following description, Q indicates a step, and the flowchart shows a case where the output state of the ultrasonic transmission means T is corrected based on the opening / closing of the driver's seat door 25 as shown in FIG.

  First, in Q1, the outside air temperature detected by the outside air temperature sensor 21 is read. Thereafter, in Q2, the ultrasonic wave transmitting means is generated according to the detected outside air temperature based on a database (stored in the storage medium of the controller U) indicating the relationship between the outside air temperature and the temperature correction value created in advance. The output state at T (frequency of the output ultrasonic wave) is corrected.

  After Q2, in Q3, it is determined whether or not the driver's seat door 25 is closed (for example, detection by a door switch). When the determination at Q3 is YES, at Q4, the reception intensity at the ultrasonic wave receiving means R is detected, and the detected value is stored (updated).

  After Q4 or when NO in Q3, it is determined in Q5 whether or not the driver's seat door 25 is open (in particular, it is fully opened or the detection is greater than the opening at which the right side lobe SR is hardly reflected). ). If YES in Q5, the reception intensity at the ultrasonic wave receiving means R is detected in Q6 and the detected value is stored (updated).

  After Q6 or when NO is determined in Q5, in Q7, whether or not a stored value of received intensity exists for both when the driver's seat door 25 is closed and when it is open. Determined. If the determination in Q7 is YES, in Q8, the difference between the reception strength when the driver's seat door 25 is closed and the reception strength when the driver's seat door 25 is open (corresponding to the strength of the right side lobe SR). Is calculated.

  After Q8, at Q9, it is determined whether or not the strength of the right side lobe SR has decreased (whether the difference is not more than a predetermined value set in advance). If the determination in Q9 is YES, in Q10, the output state of the ultrasonic transmission means T (in the embodiment, the frequency of the ultrasonic wave transmitted) is corrected in the direction in which the difference increases.

  If NO in Q7 or NO in Q9, the process returns to Q1, respectively. In the case of FIG. 12, frequency correction based on the intensity change of the main beam M may be performed based on the opening / closing of the rear gate door 26.

  FIG. 14 shows an example in which a cone (antenna) 6 or 7 is provided in the ultrasonic transmission means T and the ultrasonic reception means R, and the cones 6 and 7 are indicated by broken lines in FIG. In FIG. 3, each of the cones 6 and 7 is formed in a conical shape having a divergent shape and is configured using the mounting member 2. That is, the mounting member 2 is formed with a transmitting cone forming recess 6 that is continuous with the mounting hole 4 (that is, the ultrasonic transmission means T) and that has a rear opening in the vehicle interior. Similarly, the mounting member 2 is formed with a receiving cone forming recess 7 that is continuous with the mounting hole 5 (that is, the ultrasonic wave receiving means R) and that has a rear opening in the vehicle interior. Thus, the attachment member 2 also serves as the cone of the ultrasonic transmission means T and the ultrasonic reception means R.

  Use of the cones 6 and 7 is preferable in directing the ultrasonic beam in a desired direction. The cones 6 and 7 may be separated from the above-described openings 10 and 11 (fin portions 30, 41 and 42 set in the openings 10 and 11), but it is preferable to make them close (including abutting). .

  In setting the shape of the cone 6 (the same applies to the cone 7), the following conditions are satisfied. That is, when the diameter of the ultrasonic transmission means T is D, the opening diameter of the cone 6 is L, the directivity angle (spreading angle) of the cone 6 is θ, and the wavelength of the ultrasonic wave is λ, the following equation (1) is satisfied. Has been.

θ ≦ 70 × (λ / D) and L ≧ 2λ (1)
15 and 16 show a modification of the cone 6 (the same applies to the cone 7), and the cross section is a flat oval. In this example, the transmission direction of the ultrasonic wave can be narrowed in the flat minor axis direction, and can be widened in the major axis direction that widens greatly, and the length of the cone 6 can be shortened. The cone 6 is preferably set so as to satisfy the following conditions. Note that L is the opening width in the major axis direction, H is the axial length of the cone 6, and n is an integer (1, 2, 3,...).

θ ≧ 70 × (λ / D) and L ≧ 2λ and H = n × λ / 2 (1)
When forming a side lobe, it can be performed by devising the shape of the cone 6 (same for 7). That is, as shown by a one-dot chain line α or β in FIG. 14, the peripheral wall portion of the cone 6 in the direction in which the side lob is formed may be cut (in FIG. 14, the side lob is formed to face diagonally upward to the right).

  Here, the correction of the output state of the ultrasonic transmission means T described above is mainly assumed after shipment of the automobile manufacturing factory, but may be performed in an inspection stage before shipment of the automobile factory. That is, in the inspection process before factory shipment, the inspector opens and closes the driver's seat door 25, for example, and the difference in the reception intensity at the ultrasonic receiving means R between when the door is opened and when the door is closed is greater than or equal to a predetermined value. When it is confirmed that there is, it is possible to pass the inspection.

  It is also possible to monitor the frequency of the ultrasonic wave transmitted from the ultrasonic wave transmitting means T using, for example, a microphone and correct the frequency change when it occurs. It is also possible to directly detect the amount of ultrasonic reflection in the vehicle interior using the Doppler signal generated by the movement of an opening / closing body such as a door. That is, the frequency and magnitude of the Doppler signal generated by the movement of the opening / closing body are monitored, and when the frequency is within a predetermined range, the amount of reflected ultrasound in the vehicle interior is detected only by the magnitude of the Doppler signal. can do.

  Although the embodiment has been described above, the present invention is not limited to the embodiment, and can be appropriately changed within the scope described in the scope of claims. For example, the invention includes the following cases. . A plurality of ultrasonic transmission means T may be provided, and a plurality of ultrasonic reception means R may be provided. Further, the number of ultrasonic transmission means T and the number of ultrasonic reception means R may be different. The installation positions of the ultrasonic transmission means T and the ultrasonic reception means R can be appropriately selected. For example, the upper position of the front window glass, the upper position of the rear window glass, the roof portion at the rear end of the vehicle interior, the rear package The ultrasonic transmission means T and the ultrasonic reception means R may be installed at separate locations such as on the tray, the top surface of the instrument panel, etc. (for example, the ultrasonic transmission means T may be installed at the front end of the vehicle interior). The ultrasonic receiving means R is installed on the roof at the rear end of the vehicle interior, etc.). It is preferable to arrange the ultrasonic transmission means T and the ultrasonic reception means R close to each other in order to match the ultrasonic transmission direction and the ultrasonic reception direction, and concentrate related parts including the control system. This is preferable in terms of arrangement. Further, by setting the directions of the main beam and the side lobes in the desired direction to be the same in the ultrasonic transmitting means T and the ultrasonic receiving means R, the transmitted ultrasonic waves are efficiently received. Preferred above.

  The case where a side lobe is not formed may be sufficient. The cone may be provided only in one of the ultrasonic transmission means T and the ultrasonic reception means R. As the opening / closing body used for correcting the output state of the ultrasonic transmission means T, a passenger's seat side door, a rear seat side door, an openable sunroof, and the like can be selected as appropriate. Of course, the object of the present invention is not limited to what is explicitly stated, but also implicitly includes providing what is substantially preferred or expressed as an advantage.

  The present invention is suitably applied to, for example, an antitheft device for automobiles.

V: Vehicle T: Ultrasonic transmission means R: Ultrasonic reception means A: Detection area U: Unit body C: Controller M: Main beam SR: Right side lob SL: Left side lob 1: Sensor unit 2: Mounting member 3: Cover member 4, 5: Mounting hole 10, 11: Opening 20: Alarm 25: Driver's seat door (opening / closing body)
26: Rear gate door (opening / closing body)
30: Fin part 30L, 30R: Specific fin part

Claims (6)

In an intrusion detection apparatus for an automobile that detects ultrasonic waves transmitted from an ultrasonic transmission means toward a vehicle interior space by an ultrasonic reception means and detects intrusion into the vehicle interior,
An opening degree detecting means for detecting the opening degree of the opening and closing body defining the vehicle interior space;
Receiving intensity detecting means for detecting the receiving intensity at the ultrasonic receiving means for each different opening of the opening / closing body detected by the opening detecting means,
Correction means for correcting an ultrasonic wave transmission state in the ultrasonic wave transmission means based on a difference in reception intensity at different opening degrees of the opening / closing body detected by the reception intensity detection means;
An intrusion detection device for automobiles, comprising: In claim 1,
In addition to transmitting the main beam, the ultrasonic transmission means is set to transmit a side lobe so as to supplement the detection area by the main beam,
The opening / closing body is an opening / closing body in a position where the side lobe reflects.
An intrusion detection device for automobiles. In claim 2,
Each of the ultrasonic wave transmitting means and the ultrasonic wave receiving means is disposed at a high place at a substantially front end in a vehicle interior,
The main beam is set to face diagonally downward,
The side lob is set to face the side door,
The opening and closing body is the side door;
An intrusion detection device for automobiles. In claim 3,
The intrusion detection device for automobiles, wherein the height is a roof portion. In any one of Claims 1 thru | or 4,
The main beam transmitted by the ultrasonic transmission means is set to face the rear gate located at the rear end of the vehicle,
The opening and closing body is the rear gate;
An intrusion detection device for automobiles. In any one of Claims 1 thru | or 5,
The intrusion detection apparatus for automobiles, wherein the correction means corrects the frequency of ultrasonic waves transmitted by the ultrasonic transmission means.

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