JP6301787B2 - Object detection device - Google Patents

Description

  The present invention relates to a technique for detecting an object in a vehicle.

  Conventionally, a technique for detecting an object in a vehicle, such as a person or an object, is known. In Patent Document 1, a microwave is transmitted toward a vehicle in a parking lot, a reflected wave reflected in the vehicle is received by a device provided in the parking lot, and a person in the vehicle is received based on the received reflected wave. Techniques have been proposed for detecting the presence or absence of the presence of.

JP 09-228679 A

  However, the rate at which the transmitted radio waves are reflected from the human body present in the vehicle is smaller than the rate at which the transmitted radio waves are absorbed by the human body. That is, in the above-described technique, since the presence or absence of an object in the vehicle is detected based on a reflected wave with a low radio wave intensity, the detection accuracy may be reduced.

  An object of this invention is to provide the technique which suppresses the fall of a detection precision about the detection of the target object in a vehicle.

  One aspect of the present invention is an object detection device that is mounted on a host vehicle and detects a predetermined object between a radio wave reception side and a transmission side. The object detection device includes a transmission unit, a reception unit, and a detection unit. The transmission means is a radio wave transmission side, and transmits radio waves of a predetermined frequency. The receiving means is a radio wave receiving side and receives the radio wave transmitted from the transmitting means. Based on the difference between the intensity of the radio wave transmitted from the transmission means and the intensity of the radio wave received by the reception means, the detection means is an object at a position in the host vehicle that blocks the radio waves transmitted from the transmission means to the reception means. Detect objects.

  According to such a configuration, since the object in the vehicle is detected using the difference in intensity between the radio waves before and after passing through the object, the detection accuracy is lower than the conventional technique using the reflected wave having a low radio wave intensity. Can be suppressed.

  In addition, the code | symbol in the parenthesis described in the claim shows the correspondence with the specific means as described in embodiment mentioned later as one aspect, Comprising: The technical scope of this invention is limited is not.

The block diagram which shows the structure of the smart system of 1st Embodiment, and a vehicle-mounted apparatus. The block diagram which shows the structure of an electronic key. The figure which shows an example of arrangement | positioning of a detection transmission part and a vehicle-mounted receiving part. The flowchart of a target object detection process. (A) is a figure which shows an example of the positional relationship with the person who is the detected object on the receiving side and transmitting side of a detection transmission signal, (b)-(d) is a front passenger seat whose object is a rear seat. The figure which shows an example of the experimental result when located in the side, the center, and the driver's seat side. The flowchart of the target object detection process of 2nd Embodiment. It is a figure explaining the effect of 2nd Embodiment, (a) is a figure which shows an example of the positional relationship between the receiving side of a detection transmission signal, the transmission side, and the package which is the detected object, (A) is a figure which shows an example of an experimental result when a target object is located in the driver's seat side of a rear seat. The flowchart of the target object detection process of 3rd Embodiment. The flowchart of a theft alerting | reporting process.

Embodiments to which the present invention is applied will be described below with reference to the drawings.
[1. First Embodiment]
[1-1. Constitution]
FIG. 1 is a block diagram showing a configuration of a smart entry system 1 according to an embodiment to which the present invention is applied. As shown in FIG. 1, a smart entry system 1 according to this embodiment includes an in-vehicle device 3 mounted on a host vehicle and a portable device (electronic key) 2 configured to be carried by a user of the host vehicle. Prepare.

  The electronic key 2 is used for at least one of unlocking the door of the own vehicle, locking the door of the own vehicle, and starting the engine of the own vehicle, and transmits / receives data to / from the in-vehicle device 3 Configured as a wireless device. As shown in FIG. 2, the electronic key 2 includes a portable reception antenna 21, a portable transmission antenna 22, a portable reception unit 23, a portable transmission unit 24, and a transmission / reception control unit 25.

  The mobile receiver 23 receives a transmission radio wave in a predetermined frequency band (for example, LF band (about 100 kHz)) from the in-vehicle device 3 by the mobile reception antenna 21 and demodulates transmission data from the in-vehicle device 3. The transmission / reception control unit 25 generates and outputs response data for the in-vehicle device 3 based on the data demodulated by the mobile reception unit 23. The response data includes a predetermined authentication code. The portable transmitter 24 uses the output data from the transmission / reception controller 25 to modulate a transmission carrier wave in a predetermined frequency band (for example, UHF band (three hundred to four hundred MHz band)), thereby transmitting a transmission signal to the in-vehicle device 3. Is transmitted from the portable transmitting antenna 22. The transmission / reception control unit 25 includes a microcomputer centering on a CPU, ROM, RAM, and the like.

  Returning to FIG. The in-vehicle device 3 includes an in-vehicle communication unit 10, an outdoor lock switch 41, an unlock sensor 42, an indoor switch 43, a door opening / closing sensor 44, a detection transmission unit 31, a control ECU 50, and a control target unit 60. Note that ECU is an abbreviation for Electronic Control Unit. The in-vehicle device 3 is supplied with power even when the ignition switch of the vehicle is off.

The in-vehicle communication unit 10 includes an in-vehicle transmission unit 11 that transmits data to the electronic key 2 and an in-vehicle reception unit 12 that receives data transmitted from the electronic key 2.
The in-vehicle transmission unit 11 is provided in, for example, a driver's seat, a passenger seat, and left and right rear seats of the own vehicle. The in-vehicle transmission unit 11 uses a predetermined range around the vehicle centered on each door (for example, an area of about 1 m from the vehicle) as a communication area, and the electronic key 2 existing in the communication area. A signal is transmitted to it.

  The in-vehicle transmission unit 11 generates a transmission signal to the electronic key 2 by modulating a transmission carrier wave of a predetermined frequency band (LF band, for example, hundreds of tens kHz band) for the output data output from the control ECU 50. . And the vehicle-mounted transmission part 11 transmits the produced | generated transmission signal via the vehicle-mounted transmission antenna 111. FIG.

  As shown in FIG. 3 as an example, the in-vehicle receiving unit 12 is provided in a pillar behind the driver's seat and receives a signal transmitted from the electronic key 2. The in-vehicle receiving unit 12 demodulates data from the received signal received by the in-vehicle receiving antenna 121. The demodulated data is input to the control ECU 50. Hereinafter, data demodulated by the in-vehicle receiving unit 12 is referred to as reception data.

  For example, as shown in FIG. 3, the detection transmission unit 31 is provided at a position below the foot of the rear seat 7 behind the passenger seat. That is, the detection transmission unit 31 is set as the transmission side, the in-vehicle reception unit 12 is set as the reception side, and the detection transmission unit 31 is configured such that radio waves transmitted from the transmission side to the reception side are blocked by objects existing in the rear seat 7 of the vehicle. Is arranged. Hereinafter, the radio wave transmitted from the detection transmission unit 31 is referred to as a detection transmission signal. In FIG. 3, a person 9 a is illustrated as an example of an object existing in the rear seat 7. The detection transmission unit 31 transmits the detection transmission signal to the vehicle interior via the antenna 311 for a predetermined period according to the detection start signal output from the control ECU 50. As an example, the detection frequency that is the frequency of the detection transmission signal is the same frequency band as the transmission signal transmitted from the portable transmission unit 24 of the electronic key 2, that is, a predetermined frequency in the UHF band (three hundred to four hundred MHz band). It is stipulated in.

  Returning to FIG. The sensor unit 40 includes a detection switch and a touch sensor that detect that the user's entry / exit door has been operated by the user. Specifically, the sensor unit 40 includes an outdoor lock switch 41, an unlock sensor 42, an indoor switch 43, and a door opening / closing sensor 44.

  As an example, the outdoor lock switch 41 and the unlock sensor 42 are provided on a door handle of a passenger door on the driver's seat side. The outdoor lock switch 41 detects a pushing operation by a person on the outdoor lock switch 41 and outputs a detection signal to the control ECU 50. The unlock sensor 42 detects a human contact with the door handle of the passenger door on the driver's seat side, and outputs a detection signal to the control ECU 50.

  The indoor switch 43 is provided in the door handle of each boarding door as an example, detects a pushing operation by a person to one or the other of the two ends, and outputs a detection signal to the control ECU 50.

The door opening / closing sensor 44 is provided in each door for getting on / off as an example, detects opening / closing of each door for getting on / off, and outputs a detection signal to the control ECU 50.
The control target unit 60 includes a plurality of devices that control the behavior of the control target in the host vehicle. The control objects include at least a door opening / closing mechanism 611 that is provided at each entrance door and opens / closes the door, an alarm device 62, a lighting device 63, and the like. In addition, each device configuring the control target unit 60 may perform various controls by controlling the behavior of the control target according to a command (output signal) from the control ECU 50. The control target unit 60 includes at least a body ECU 61 that controls the door opening / closing mechanism 611 as a control target.

  When the body ECU 61 is set to a lock standby state, which will be described later, when a push operation by a person to the outdoor lock switch 41 is detected, the body ECU 61 operates the door opening / closing mechanism 611 according to a command from the control ECU 50, for example. The door locks of all entrance doors are automatically locked. Further, when the body ECU 61 is set to an unlock standby state to be described later, when a contact operation by a person to the door handle on the driver's seat side is detected by the unlock sensor 42, the body ECU 61 receives a command from the control ECU 50. The opening / closing mechanism 45 is operated to automatically release the door lock. Further, the body ECU 61 operates the door opening / closing mechanism 611 in response to a command from the control ECU 50 when a pushing operation by one person to the one end of the indoor switch 43 is detected. Automatically lock the door lock. Also, the body ECU 61 activates the door opening / closing mechanism 611 according to a command from the control ECU 50 when a pushing operation by a person to the other end of the indoor switch 43 is detected, and the boarding / exiting with the indoor switch 43 is provided. The door lock of the door is automatically unlocked.

  The alarm device 62 generates a warning sound toward the outside of the vehicle according to a command from the control ECU 50. In response to a command from the control ECU 50, the lighting device 63 blinks the lighting device 63 and issues a warning toward the outside of the vehicle.

  Similar to the transmission / reception control unit 25 of the electronic key 2, the control ECU 50 includes a microcomputer centered on a CPU 51, ROM 52, RAM 53, and the like. The CPU 51 in the control ECU 50 performs control processing such as unlock control processing and lock control processing based on communication with the electronic key 2 in accordance with a program stored in the ROM 52, and executes an object detection processing described later. .

  Specifically, the control ECU 50 performs the control process as follows in the unlock control process and the lock control process. That is, as an example, when all the entrance doors are locked when the host vehicle is parked, the control ECU 50 exists in the communication area by transmitting and receiving data using the in-vehicle transmission unit 11 and the in-vehicle reception unit 12. The electronic key 2 is detected. The control ECU 50 confirms that the electronic key 2 is a key registered in advance in the host vehicle (hereinafter referred to as a registration key) based on an authentication code included in the received signal (received data), and after confirmation, the body ECU 61 To unlock standby. Then, when the body ECU 61 is set to the unlock standby state by the control ECU 50, when the contact of the person with the door handle on the driver's seat side is detected by the unlock sensor 42, as an example, all of the passenger doors 61 Unlock control to automatically unlock the door.

  Further, for example, when the user gets off when the host vehicle is parked, the control ECU 50 confirms that the electronic key 2 is a registration key based on the authentication code, and after confirmation, the body ECU 61 locks the body ECU 61. Put it in a state. When the control ECU 50 sets the lock standby state, the body ECU 61 automatically locks the door locks of all the entrance doors as an example when a push operation of the person on the outdoor lock switch 41 is detected. Perform lock control.

  As described above, in the smart entry system 1 of the present embodiment, by carrying the electronic key 2, when the user gets into the parked vehicle, the user automatically performs without performing a special operation for unlocking the door. The door lock is unlocked. Further, by carrying the electronic key 2, the door lock is automatically locked without performing a special operation for locking the door lock after the user gets off the parked vehicle.

[1-2. processing]
The object detection process executed by the CPU 51 included in the control ECU 50 will be described with reference to the flowchart shown in FIG. The object detection process is executed as a trigger when all the entrance doors are locked when the host vehicle is parked. It is assumed that the engine is stopped when the host vehicle is parked.

In S110, the control ECU 50 outputs a detection start signal and causes the detection transmission unit 31 to transmit a detection transmission signal.
Subsequently, in S120, the control ECU 50 acquires received data.

  Next, in S130, the control ECU 50 determines whether or not the reception data (including the reception signal) acquired in S120 is transmitted from the detection transmission unit 31. When the received data is not transmitted from the detection transmitter 31 (S130; NO), the control ECU 50 ends the object detection process, and when the received data is transmitted from the detection transmitter 31 (S130). YES), the process proceeds to S140. Specifically, the control ECU 50 determines that the received data is transmitted from the electronic key 2 when the received data includes an authentication code. That is, it is determined that it is not transmitted from the detection transmission unit 31. The control ECU 50 determines that the received data is transmitted from the detection transmission unit 31 when the received data does not include the authentication code. That is, since both the transmission signal from the electronic key 2 and the detection transmission signal are radio waves in the UHF band, the control ECU 50 determines that the reception data acquired in S120 is based on the detection transmission signal from the detection transmission unit 31. After specifying, the process after S140 is performed.

  In S140, which is shifted when it is determined that the signal is transmitted from the detection transmission unit 31, the control ECU 50 receives the received signal strength including the reception data acquired in S120, that is, received by the in-vehicle reception unit 12. The reception intensity of the detected transmission signal is detected.

  Next, in S150, the control ECU 50 determines whether or not there is a person in the own vehicle. When the control ECU 50 determines that there is no person in the host vehicle (S150; NO), the control ECU 50 ends the target object detection process, and determines that there is a person in the host vehicle (S150; YES). The process proceeds to S160. The control ECU 50 determines whether there is a person in the vehicle based on the difference between the intensity of the detection transmission signal transmitted from the detection transmission unit 31 and the intensity of the detection transmission signal received by the in-vehicle reception unit 12. Judging.

  Specifically, the control ECU 50 determines that the absolute value of the difference between the reference intensity recorded in advance in the ROM 52 and the received intensity detected in S140 (referred to as a difference value) is equal to or greater than a predetermined first threshold (difference value ≧ In the case of (first threshold value), it is determined that there is a person in the rear seat 7 in the own vehicle. The reference value refers to the detected transmission signal when the transmission / detection unit 31 on the transmission side and the in-vehicle reception unit 12 (the in-vehicle reception antenna 121) on the reception side do not block radio waves. The reception intensity of the detected transmission signal when received at. The reference intensity is recorded in advance in the ROM 52 as an example.

  In S160 which shifts when it is determined that there is a person in the rear seat 7 in the host vehicle, the control ECU 50 performs notification in the first mode. And this target object detection process is complete | finished. Specifically, the control ECU 50 notifies the outside of the host vehicle that an occupant remains in the rear seat 7 in the host vehicle, with the alarm device 62 generating a warning sound toward the outside of the vehicle as a first mode. To do.

[1-3. effect]
According to the first embodiment described in detail above, the following effects can be obtained.
[1A] Based on the difference between the intensity of the detection transmission signal transmitted from the detection transmission unit 31 and the intensity of the detection transmission signal received by the in-vehicle reception unit 12, the detection transmission unit 31 transmits the difference to the in-vehicle reception unit 12. The presence / absence of a person at a position in the vehicle that blocks the detected transmission signal is detected (S150). According to this, since the presence / absence of a person in the vehicle is detected using the difference in intensity of the radio wave before and after passing through the object, the detection accuracy is higher than that of the conventional technique using a reflected wave with a low radio wave intensity. The decrease can be suppressed.

  Here, FIG. 5 (b) to FIG. 5 (d) show the difference when the person 9a is present at each position on the passenger seat 6 side, the center, and the driver seat 5 side of the rear seat 7 of the own vehicle. It is a figure which shows an example of the detected experimental result. In the experiment, as shown in FIG. 5A, in the vehicle interior, the detection transmission unit 31 is provided at a position under the foot of the rear seat 7, and the in-vehicle reception unit 12 is provided at the pillar on the rear side of the driver seat 5. The detection frequency was set to 302 [MHz] as an example. The first threshold value is A [dB] which is a predetermined value. As a result of the experiment, as shown in FIGS. 5 (b) to 5 (d), even if the person 9 a exists at any position on the passenger seat 6 side, center, and driver seat 5 side of the rear seat 7, the difference value Was equal to or greater than the first threshold A [dB], and it was possible to detect the presence of the person 9a in the rear seat 7.

  [1B] When the difference is greater than or equal to a predetermined first threshold (S150; YES), the object detected inside the host vehicle is regarded as a human body. According to this, since the human body easily absorbs radio waves and the difference is easily detected, it is possible to accurately detect the presence of a person inside the host vehicle based on the difference by appropriately setting the first threshold value. .

  [1C] When the presence of a person in the host vehicle is detected after all the entrance doors are locked when the host vehicle is parked, the alarm device 62 notifies the outside of the host vehicle. According to this, it is possible to notify the outside of the host vehicle that an occupant remains in the host vehicle.

  [1D] A detection transmission signal for detecting the presence of a person in the rear seat 7 in the host vehicle is received by using the in-vehicle receiving unit 12 used for communication with the electronic key 2 in the smart entry system 1. According to this, instead of individually providing a device that receives the detection transmission signal, the vehicle-mounted reception unit 12 that is a reception-side device in the smart entry system 1 is also used as a device that receives the detection transmission signal. 3 can be reduced in size and weight.

  In the first embodiment, the in-vehicle device 3 corresponds to an example of an object detection device, the detection transmission unit 31 corresponds to an example of a transmission unit, the in-vehicle reception unit 12 corresponds to an example of a reception unit, and the control ECU 50 Corresponds to an example of the detection unit and the notification unit, and the alarm device 62 corresponds to an example of the notification unit. Further, S150 corresponds to an example of processing of the detection unit, and S160 corresponds to an example of processing of the notification unit.

[2. Second Embodiment]
[2-1. Constitution]
Since the basic configuration of the second embodiment is the same as that of the first embodiment, the description of the common configuration will be omitted, and the description will focus on the differences.

  In 1st Embodiment mentioned above, the person in the backseat 7 in the own vehicle was detected. On the other hand, in the second embodiment, in addition to the person, the first object is that an object different from the person in the rear seat 7 in the own vehicle, for example, a predetermined object such as a luggage in the rear seat 7 is detected. It is different from the embodiment. Specifically, as shown in FIG. 6, in the object detection process executed by the control ECU 50 of the present embodiment, S170 to S180 are added compared to the object detection process in the first embodiment shown in FIG. Is different.

[2-2. processing]
Next, the object detection process executed by the control ECU 50 of the present embodiment will be described using the flowchart of FIG.

  In S110 to S160, the same processing as in the first embodiment is executed. However, if the control ECU 50 determines in S150 that there is no person in the rear seat 7 in the host vehicle (S150; NO), the control ECU 50 shifts the process to S170.

  In S170, the control ECU 50 determines whether another object different from a person, such as a luggage, is present in the rear seat 7 in the own vehicle. When the control ECU 50 determines that no luggage is present in the rear seat 7 in the host vehicle (S170; NO), the control ECU 50 ends the target object detection process and determines that there is a luggage (S170; YES). The process proceeds to S180. Specifically, the control ECU 50 has a difference value that is less than a predetermined first threshold (first threshold> difference value) and is equal to or greater than a predetermined second threshold that is smaller than the first threshold (difference value). If ≧ second threshold value), it is determined that the luggage is present in the rear seat 7 in the host vehicle.

  In S180, the control ECU 50 notifies the outside of the host vehicle that the luggage remains in the host vehicle in the second mode. And this target object detection process is complete | finished. Specifically, the control ECU 50 sets the lighting device 63 to blink as a second mode.

[2-3. effect]
According to the second embodiment described in detail above, the following effects are obtained in addition to the effects [1A] to [1D] of the first embodiment described above.

  [2A] When the difference is less than the first threshold and greater than or equal to a predetermined second threshold smaller than the first threshold, the detected object is regarded as a predetermined object different from a person. . According to this, by appropriately determining the second threshold value, the presence / absence of the object in the rear seat 7 of the host vehicle is detected using the difference in the intensity of radio waves before and after passing through an object different from a person. be able to.

  Here, as shown in FIG. 7A, an example of the experimental result of detecting the difference when the luggage 9b is present at the position of the driver's seat 5 side of the rear seat 7 in the passenger compartment is shown in FIG. Shown in In the experiment, the positions of the detection transmitter 31 and the in-vehicle receiver 12, the detection frequency, and the first threshold value were the same as those in the experimental result shown in FIG. 4. The second threshold value is set to B [dB], which is a predetermined value smaller than the first threshold value A [dB] (A> B). As an example, a shopping bag with a capacity of about 6 L (liter) was used as the luggage 9b. As a result of the experiment, as shown in FIG. 7B, for example, when the luggage 9b is present at the position of the driver seat 5 side of the rear seat 7, the difference value is equal to or greater than the second threshold B [dB] and the first It became less than the threshold value A [dB], and it was possible to detect the presence of the luggage 9b in the rear seat 7.

  [2B] When the presence of an object different from the person in the rear seat 7 in the own vehicle is detected, the lighting device 63 notifies the outside of the own vehicle that an object different from the person exists in the own vehicle. According to this, it is possible to notify the outside of the host vehicle that a predetermined object other than a person is left in the host vehicle.

  [2C] The notification mode when the presence of an object different from the person in the rear seat 7 in the own vehicle is detected is different from the notification mode when a person is present. According to this, it is possible to specify from outside the host vehicle whether the target object remaining in the host vehicle is a person or an object different from the person based on the notification mode.

In the second embodiment, the lighting device 63 corresponds to an example of a notification device. Further, S180 corresponds to an example of processing as notification means.
[3. Third Embodiment]
[3-1. Constitution]
Since the basic configuration of the third embodiment is the same as that of the first embodiment, the description of the common configuration will be omitted, and the description will focus on the differences.

  The third embodiment is different from the first embodiment in that the detection result of the object detection process of the first embodiment is applied to a theft notification process described later. Specifically, the control ECU 50 of the present embodiment is different from the first embodiment in that the theft notification process and the object detection process are executed in parallel. Further, the object detection process executed by the control ECU 50 of the present embodiment differs from the object detection process in the first embodiment shown in FIG. 4 in that S100 and S155 are added and S160 is deleted. .

[3-2. processing]
[3-2-1. Object detection process]
The object detection process executed by the CPU 51 provided in the control ECU 50 of the present embodiment will be described with reference to the flowchart shown in FIG.

  In S100, the control ECU 50 resets the person detection flag. Specifically, the person detection flag indicates that a person is present in the rear seat 7 in the own vehicle when set, and a person is present in the rear seat 7 in the own vehicle when reset. This flag indicates that it does not exist. As an example, it is assumed that the person detection flag is set when the value of the person detection flag is 1, and that the person detection flag is reset when the value is 0.

  In S110 to S150, the same processing as in the first embodiment is executed. However, if the control ECU 50 determines in S150 that there is a person in the rear seat 7 within the host vehicle (S150; YES), the control ECU 50 shifts the process to S155.

In S155, the control ECU 50 sets a human detection flag and ends the target object detection process.
That is, in this object detection process, when it is determined that there is a person in the rear seat 7 in the host vehicle (S150; YES), the person detection flag is set instead of the notification to the outside of the vehicle in the first embodiment. .

[3-2-2. Theft notification process]
An overview of a theft notification process given as an example in the present embodiment will be described. For example, it is assumed that the driver leaves the host vehicle by locking all the entrance / exit doors when the host vehicle is parked. At this time, if a suspicious person is lurking in the own vehicle without being noticed by the driver, a situation may occur in which the own vehicle is stolen by the suspicious person. The theft notification process is a process for suppressing the own vehicle from being stolen by such a suspicious person lurking in the own vehicle.

  The theft notification process is executed in parallel with the object detection process by the CPU 51 in the control ECU 50 in accordance with the program recorded in the ROM 52. The theft notification process is repeatedly executed every predetermined period triggered by the fact that all the entrance / exit doors are locked when the host vehicle is parked. The theft notification process will be described with reference to the flowchart of FIG.

  In S (step) 10, the control ECU 50 determines whether any of the entry / exit doors has been opened from the inside of the host vehicle. When the control ECU 50 determines that any of the entry / exit doors has not been opened from the inside of the host vehicle (S10; NO), the control ECU 50 ends the theft notification process, and any of the entrance / exit doors is from the inside of the own vehicle. If it is determined that it has been opened (S10; YES), the process proceeds to S20. Specifically, the control ECU 50 detects that one of the entrance / exit doors has been opened by the door opening / closing sensor 44, and the door lock of the opened entrance door is provided in the entrance / exit door. When it is detected that the switch 43 has been released by pressing the switch 43, it is determined that the passenger door has been opened from the inside of the host vehicle.

  In S20, which is shifted when it is determined that the entrance / exit doors are opened from the inside of the host vehicle, the control ECU 50 occupies the rear seat 7 in the host vehicle when all the entrance / exit doors are locked when the host vehicle is parked. It is determined whether or not is left. When there is an occupant remaining in the rear seat 7 in the host vehicle (S20; YES), the control ECU 50 ends the theft notification process, and no occupant is left in the rear seat 7 in the host vehicle ( S20; NO), the process proceeds to S30. Specifically, when the person detection flag is set, the control ECU 50 indicates that an occupant is left in the rear seat 7 in the own vehicle when all the entrance doors are locked when the own vehicle is parked. to decide.

  In S30 which shifts when it is determined that no occupant is left in the rear seat 7 in the host vehicle, the control ECU 50 performs theft notification and ends the theft notification stop processing. Specifically, the control ECU 50 uses a warning device 62 to generate a warning sound toward the outside of the vehicle to notify theft.

[3-3. effect]
According to the third embodiment described in detail above, in addition to the effects [1A] to [1B] and [1D] of the first embodiment described above, the following effects can be obtained.

  [3A] When no passengers are left in the host vehicle when all the doors are locked when the host vehicle is parked (S20; NO), the control ECU 50 determines any of the passenger doors after that. Is opened from the inside of the host vehicle, a warning sound is generated as a suspicious person is present in the host vehicle without being noticed by the passenger. The reason for generating the warning sound is to notify the outside of the own vehicle of the presence of the suspicious person and to prevent the own vehicle from being stolen by the suspicious person.

  However, if all passengers are left in the host vehicle when all of the passenger doors are locked when the host vehicle is parked (S20; YES), the control ECU 50 determines any of the passenger doors after that. Even if the vehicle is opened from the inside of the host vehicle, a warning sound is not generated as if the passenger door was opened by the passenger. Whether or not an occupant is left in the host vehicle is detected based on a difference between the intensity of the detection transmission signal transmitted from the detection transmission unit 31 and the intensity of the detection transmission signal received by the in-vehicle reception unit 12. The

Thereby, it is possible to prevent an unnecessary alarm sound from being generated during the execution of the theft notification process.
[4. Other Embodiments]
As mentioned above, although embodiment of this invention was described, it cannot be overemphasized that this invention can take a various form, without being limited to the said embodiment.

  [4A] In the above embodiment, the transmission signal transmitted from the electronic key 2 and the detection transmission signal transmitted from the detection transmission unit 31 use the same frequency band (UHF band). For this reason, when the reception data does not include the authentication code, it is determined that the reception signal including the reception data is transmitted from the detection transmission unit 31 (S130; YES). However, the determination as to whether the received signal is transmitted from the detection transmitter 31 is not limited to this. For example, the data length of the data transmitted from the detection transmitter 31 is set to a length different from the data length of the data transmitted from the electronic key 2 (for example, longer than the data length of the electronic key 2), and the received data Based on the data length, it may be determined whether or not the received signal including the received data is transmitted from the detection transmission unit 31.

  [4B] The transmission frequency of the transmission signal from the electronic key 2 and the detection frequency are set to different frequencies, and the reception signal from any device of the electronic key 2 and the detection transmission unit 31 based on the different frequencies. You may judge whether it is.

  [4C] In the above embodiment, the detection frequency is set to a predetermined frequency in the UHF band, but is not limited thereto. The detection frequency may be set to an arbitrary frequency band (for example, an ISM (Industry-Science-Medical) band frequency).

  [4D] In the above-described embodiment, the control is performed to issue a warning toward the outside of the vehicle using the alarm device 62 and the lighting device 63. However, these are only examples, and devices other than the alarm device 62 and the lighting device 63 are A warning may be executed. In addition, for example, the lighting device 63 may be used to notify that a person has been detected, or the alarm device 62 may be used to notify that an object different from a person has been detected. The alarm device 62 may be a device such as a horn or a buzzer, and the lighting device 63 may be a hazard lamp, for example.

  [4E] In the second embodiment, the notification is performed in different notification modes when a person is detected and when an object different from the person is detected. However, the notification mode is changed for each detected object. Instead, notification may be performed in the same notification mode.

[4F] In the above embodiment, the presence of an object in the rear seat 7 in the host vehicle is detected. However, the present invention is not limited to this. For example, the presence of an object in a passenger seat may be detected.
[4G] In the above embodiment, the vehicle-mounted receiving unit 12 used for communication with the electronic key 2 in the smart entry system 1 receives a detection transmission signal for detecting the presence of a predetermined object in the host vehicle. Used as a device. However, the present invention is not limited to this, and the in-vehicle device 3 may include a device that receives the detection transmission signal as a device different from the in-vehicle receiving unit 12.

  [4H] In the above embodiment, a device (detection transmission unit 31) that transmits a detection transmission signal that detects the presence of a predetermined object in the host vehicle, and a device that receives the detection transmission signal (vehicle-mounted reception unit 12). ) And one each. However, the present invention is not limited to this, and the in-vehicle device 3 may include a plurality of devices that transmit the detection transmission signal, or may include a plurality of devices that receive the detection transmission signal.

  [4I] The functions of one component in the above embodiment may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. Further, at least a part of the configuration of the above embodiment may be replaced with a known configuration having the same function. Moreover, you may abbreviate | omit a part of structure of the said embodiment as long as a subject can be solved. In addition, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of the other embodiment. In addition, all the aspects included in the technical idea specified from the wording described in the claims are embodiments of the present invention.

  [4J] The present invention is not limited to the smart entry system 1, the in-vehicle device 3, and the control ECU 50, but a program for causing the control ECU 50 to function, a medium on which the program is recorded, an object detection method, and the like. Can be realized.

  DESCRIPTION OF SYMBOLS 3 ... In-vehicle apparatus 12 ... In-vehicle receiving part 31 ... Detection transmission part 3150 ... Control ECU 51 ... CPU 62 ... Alarm apparatus 63 ... Lighting apparatus.

Claims (3)

An object detection device (3) mounted on the host vehicle for detecting a predetermined object between a reception side and a transmission side of radio waves,
A transmission means (31) which is a transmission side of the radio wave and transmits a radio wave of a predetermined frequency;
A receiving means (12) which is the receiving side of the radio wave and receives the radio wave transmitted from the transmitting means;
Based on the difference between the intensity of the radio wave transmitted from the transmitting means and the intensity of the radio wave received by the receiving means, the position in the host vehicle that blocks the radio wave transmitted from the transmitting means to the receiving means. Detection means (50) for detecting an object;
Equipped with a,
When the difference is greater than or equal to a predetermined first threshold, the detection means regards the detected object as a human body, and the difference is less than the first threshold and smaller than the first threshold. An object detection apparatus characterized in that, when the value is equal to or greater than a predetermined second threshold, the detected object is regarded as a predetermined object different from a human body . The object detection device according to claim 1 ,
Informing means (50) for notifying the presence of the object in the host vehicle by the notifying device (62) when the object is detected by the detecting means.
An object detection apparatus comprising: The object detection device according to claim 1 or 2 , wherein
Informing means (50) for notifying the presence of the object in the host vehicle by the notifying device (62) when the object is detected by the detecting means.
With
The object detection device according to claim 1, wherein the notification means notifies the object detected by the detection means in a different manner depending on whether the object is a human body or an object different from the human body.