JP2004220180A - Vehicle detection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle detection system which is usable to prevent the theft of an automobile or search the parking position of the automobile at low cost and further can rapidly respond to the theft of the automobile even when the parking position is short distance. <P>SOLUTION: This vehicle detection system comprises an on-vehicle unit with a radio communication means, which is mounted on the automobile, and a portable unit with a radio communication means and a reporting means. In this system, when the communication between the on-vehicle unit and the portable unit by the radio communication means is cut, the reporting means is operated to report it (step S7), and a gain adjustment processing (step S3) for adjusting the transmitting output or receiving sensitivity of the radio communication means of the on-vehicle unit or the radio communication means of the portable unit in the state where the on-vehicle unit is distant from the portable unit is performed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle detection system that uses wireless communication to prevent theft of a vehicle and search for a parking position of the vehicle.
[0002]
[Prior art]
In recent years, practical use of Bluetooth standard short-range wireless communication has been promoted. Bluetooth communication is expected to be installed in many electronic devices in the future, and is considered to be usable for a wide variety of applications.
[0003]
Therefore, the present inventors have studied a device that is useful for preventing theft of a car by using Bluetooth communication or searching for a car of one's own in a vast parking lot, for example.
[0004]
In addition, when the prior art of such a technology was investigated, the following Patent Document 1 was found. According to the technology of Patent Document 1, a helmet and a motorcycle are connected for communication via a Bluetooth unit, and when the connection is broken, the Bluetooth unit of the motorcycle is moved from a mobile phone set to the motorcycle to a mobile phone such as an owner. The telephone is transmitted to notify the occurrence of the theft.
[0005]
[Patent Document 1]
JP-A-2002-264874
[0006]
[Problems to be solved by the invention]
However, in the above-mentioned conventional technology, although theft can be prevented by reporting the theft, there is a problem that the cost is high because it is necessary to provide the motorcycle and the user with mobile phones. Furthermore, consideration is not given to the communicable distance and notification timing.For example, when a parking lot is nearby, communication is cut off only after the motorcycle has been considerably moved, and notification is performed after that, so measures must be taken. It may cause problems such as delay.
[0007]
An object of the present invention is to provide a low-cost vehicle detection system that can be used to prevent theft of a car and to find a parking position of the car. It is still another object of the present invention to provide a vehicle detection system that can perform optimal processing regardless of a distance to a parking position of a car and can quickly respond to a movement of the car even when the parking position is short. .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is provided with a vehicle-mounted unit having a wireless communication unit and mounted on a vehicle, a communication monitoring unit for monitoring a communication state with the wireless communication unit, and a notification unit, and is made portable. A portable unit, wherein when the communication monitoring means determines that the communication between the in-vehicle unit and the portable unit by the wireless communication means has been disconnected, the notifying means is operated so that the notification is performed. It is composed.
[0009]
According to such a means, the two wireless communication means detect that the vehicle has moved beyond the communicable distance, and the portable unit notifies the vehicle based on the detection, so that the vehicle is moving. Can be provided to the owner to prevent theft at low cost.
[0010]
Desirably, the wireless communication means is of the Bluetooth standard. Thus, the configuration can be made compact and low power consumption can be achieved.
[0011]
More preferably, the on-vehicle unit is provided with a communication monitoring means for monitoring a communication state and an alarm means for outputting an alarm, and the communication monitoring means allows communication between the on-vehicle unit and the portable unit by the wireless communication means. It is preferable that the alarm means is activated to output an alarm when it is determined that the is disconnected. As a result, a warning can be issued to the criminal and its surroundings to prevent theft.
[0012]
More desirably, a gain adjustment process for adjusting the transmission output or the reception sensitivity of the wireless communication means of the on-vehicle unit or the wireless communication means of the portable unit in a state where the on-vehicle unit and the portable unit are separated from each other is performed. good.
[0013]
By this gain adjustment processing, even when the parking position of the vehicle is near or far, it is possible to perform wireless communication with the optimum output and sensitivity for the distance, so that a delay occurs before the movement of the vehicle is noticed, It is possible to avoid such a problem that the communication connection is cut off and a notification or an alarm is issued even though the vehicle is not moving or the mobile unit is slightly moved.
[0014]
Here, the conditions for starting the gain adjustment process include, for example, a case where a user operation for starting the gain adjustment process is performed, and a case where a predetermined time elapses after the user sets the first operation mode for theft prevention. Various conditions can be set, for example, when the in-vehicle unit and the portable unit are separated from each other by a certain distance by detecting the signal strength of the partner unit, or when a predetermined time has elapsed after the separation from the certain unit. Further, the optimum output and sensitivity are given with some margin from a point where connection is possible.
[0015]
Preferably, one or both of the in-vehicle unit and the portable unit are provided with mode selection means for selecting an operation mode, and when the first operation mode is selected by the mode selection means, the communication monitoring means is provided. When the second operation mode is selected by the mode selection means, the operation when the communication is determined to be disconnected is performed while the communication monitoring means determines that the communication is disconnected. It is preferable to configure so that no operation is performed.
[0016]
Specifically, when the second operation mode is selected by the mode selection means, and when the communication monitoring means determines that the communication by the wireless communication means has been once disconnected and then reconnected, It is preferable that the notification is made by the notification means. By the notification of the second operation mode, for example, it is possible to provide assistance for finding out his / her vehicle in a vast parking lot.
[0017]
Further, the on-vehicle unit is configured to be able to control the lighting of a vehicle lamp, and in the second operation mode, when it is determined by the communication monitoring means that the communication by the wireless communication means has been temporarily disconnected and then reconnected. Preferably, the lamp of the vehicle is turned on under the control of the on-vehicle unit. This lighting process makes it easier to find one's vehicle.
[0018]
Desirably, the portable unit is configured integrally with a vehicle key. Further, a key ring or the like that can be integrated with the key may be used. As a result, the present invention can be used without increasing the number of articles that the user must carry.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 is a configuration diagram of a vehicle-mounted unit of a vehicle detection system according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a portable unit of the vehicle detection system.
[0021]
The vehicle detection system according to this embodiment includes two units: an on-vehicle unit 10 mounted on an automobile, and a portable unit 40 that is integrated with a key and carried.
[0022]
The on-vehicle unit 10 is always installed in the vehicle, and as shown in FIG. 1, an antenna 11 for transmitting and receiving signals in a frequency band used for Bluetooth communication, and a communication process in accordance with the Bluetooth standard according to a command. A Bluetooth module 12 as a wireless communication unit for performing the operation, a CPU (Central Processing Unit) 13 for executing a program to control the entire unit, and a ROM (Read Only Memory) 14 for storing a control program and control data for the CPU 13 A random access memory (RAM) 15 for providing a work space to the CPU 13, an I / O interface 16 for transferring data between the CPU 13 and each input / output module, and a switch as mode selection means for switching an operation mode 17 and alarm means And a lamp controller 19 connected to a control circuit of the turn signal of the automobile and controlling the operation of the turn signal. The on-vehicle unit 10 operates by receiving power supply from, for example, a car battery.
[0023]
As shown in FIG. 2, the portable unit 40 includes an antenna 41 similar to that mounted on the vehicle-mounted unit 10, a Bluetooth module 42 as a wireless communication unit, a CPU 43, a ROM 44, a RAM 45, and an I / O interface 46. , An LED (Light Emitting Diode) 47 and a buzzer 49 as notification means, and a switch 48 as mode selection means for switching operation modes.
[0024]
The size of the Bluetooth module 42 has been reduced to the size of one coin in combination with the antenna 41. Further, the CPU 43, the ROM 44, the RAM 45, and the I / O interface 46 are integrated into one chip, and a power source such as, for example, By using a button-type small battery, the size of the portable unit 40 can be reduced to such an extent that it can be compared with the key of a general automobile. Therefore, for example, by providing the portable unit 40 stacked on the grip portion of the key, it is possible to integrate the key and the portable unit 40 to such an extent that the grip portion is slightly larger.
[0025]
The portable unit 40 may be configured as a key holder, and the key holder may be integrated with a key, or an electronic key that opens and closes a door of a vehicle and starts an engine by a radio signal or an optical signal. In such a case, the portable unit can be similarly mounted on a board or a housing on which the circuit for the key is mounted, so that integration with the key can be easily achieved.
[0026]
The vehicle detection system of this embodiment has two types of operation modes: an anti-theft mode and a position detection mode. In the anti-theft mode, the communication between the in-vehicle unit 10 and the portable unit 40 monitors that the vehicle is within the communicable range, and when communication becomes impossible, determines that the vehicle is stolen and outputs a notification or alarm. In the position detection mode, for example, when trying to find his or her own car in a vast parking lot, the on-vehicle unit 10 and the portable unit 40 attempt a communication connection. Is determined to be nearby, the portable unit 40 notifies the user, or the in-vehicle unit 10 blinks the hazard lamp of the vehicle to notify the user of the position of the vehicle.
[0027]
Hereinafter, the details of the operations in the anti-theft mode and the position detection mode will be sequentially described with reference to flowcharts.
[0028]
FIG. 3 shows a flowchart of the anti-theft polling process executed by the CPU 13 of the vehicle-mounted unit 10 when the anti-theft mode is set.
[0029]
The anti-theft polling process is started, for example, by setting the in-vehicle unit 10 to the anti-theft mode when the user gets off the car. When this process is started, first, in step S1, it is checked whether a communication link with the portable unit 40 has been established. If the communication link has been established, the process directly proceeds to step S3. After performing the process of establishing a communication link in step, the process proceeds to step S3.
[0030]
In step S3, RF gain adjustment processing for adjusting the transmission output or reception sensitivity of the radio wave to an optimum value is performed. This RF gain adjustment processing will be described later in detail with reference to FIGS. In the RF gain adjustment processing, the optimum value of the transmission output and the reception sensitivity is, for example, a value obtained by adding a margin to a value as short as possible for communication.
[0031]
The timing for actually adjusting the transmission output or the reception sensitivity in the RF gain processing in step S3 is not immediately after shifting from step S2 to step S3, but after a predetermined time (for example, 3 to 5 minutes) has elapsed. You may do it. Alternatively, the adjustment may be performed after receiving a notification from the portable unit 40 that a user operation for performing the RF gain adjustment has been performed. By providing such a timing gap, adjustment of the RF gain can be prevented from being performed immediately after the user gets off the vehicle or while moving, and can be performed when the user is calm at the destination. .
[0032]
After the RF gain adjustment process in step S3 is completed, the process proceeds to step S4 to perform a process of transmitting polling data to the portable unit 40. This polling data is for confirming whether or not communication with the counterpart unit is possible.
[0033]
Next, in step S5, the process waits for data reception and waits for a predetermined time, and after waiting for the predetermined time, shifts to step S6 to check whether acknowledgment (confirmation notification of reception of polling data) data for polling data has been received. If the acknowledgment data has been received, the process returns to step S4 to repeat the polling data transmission process again. The processes in steps S4 to S6 function as monitoring means for monitoring the communication state.
[0034]
On the other hand, if the acknowledgment data has not been received, it is determined that the car has been moved by theft, and the process proceeds to step S7, where a loud alarm sound is output from the buzzer 18 of the vehicle-mounted unit 10. The warning sound alerts the stolen person to getting off the car and fleeing, or informs the surroundings of the stolen car and provides a clue to the case. When the alarm sound is output in step S7, the anti-theft polling process is terminated.
[0035]
The anti-theft polling process is executed not only on the in-vehicle unit 10 side but also on the portable unit 40 side. When executed on the portable unit 40 side, the alarm issuance process of step S7 is changed to a process of notifying that the communication has been disconnected by driving the LED 47 or the buzzer 49.
[0036]
FIG. 4 shows a flowchart of a subroutine process for adjusting the reception gain as the RF gain adjustment process performed in step S3 in FIG.
[0037]
The RF gain adjustment processing in step S3 is performed by adjusting either the transmission output or the reception sensitivity. First, a case where adjustment is performed by adjusting reception sensitivity will be described with reference to the flowchart of FIG.
[0038]
When the process proceeds to the subroutine process, first, the transmission output and the reception sensitivity are set to the maximum values in steps S10 and S11, and the process proceeds to step S12. The function of changing the transmission output and the reception sensitivity is a function provided in advance in the Bluetooth modules 12 and 42 according to the Bluetooth protocol, and can be performed by outputting a predetermined command to the Bluetooth modules 12 and 42.
[0039]
When the process proceeds to step S12, transmission of polling data to the portable unit 40 (step S12), standby for a predetermined time for data reception (step S13), and confirmation of reception of acknowledgment data (step S14) are sequentially performed. If not, the process returns to step S13 to wait for reception again, and if acknowledgment data has been received, the process proceeds to the next step S15.
[0040]
In step S15, a command is sent to the Bluetooth module to output communication quality information. In step S16, the communication quality information is compared with a predetermined threshold. Here, the communication quality information is a numerical value of the communication quality of the data communication. The larger the value, the better the quality, and the smaller the value, the worse the quality.
[0041]
As a result, if the communication quality is equal to or higher than the threshold, the reception sensitivity is set to be decremented by "1" in step S17, the process returns to step S12, and the processing in steps S12 to S16 is repeated again. In step S18, the reception sensitivity is set to be added by "1", and the subroutine processing ends.
[0042]
By such a subroutine process, the transmission output is maximum, and the reception sensitivity can be adjusted to a position where a margin is provided a little more than just to maintain the communication quality.
[0043]
Next, the case where the RF gain adjustment processing is performed by adjusting the transmission output will be described. FIG. 5 shows a flowchart of a subroutine process when the transmission gain is adjusted as the RF gain adjustment process in step S3 in FIG.
[0044]
When adjusting the transmission output as the RF gain adjustment processing, first, the processing of setting the transmission output to the maximum value (step S20), the processing of setting the reception sensitivity to the maximum value (step S21), and polling the unit on the other end A process of transmitting data (step S22), a process of waiting for a predetermined time for data reception (step S23), and a process of confirming whether or not acknowledgment data has been received (step S24) are sequentially performed.
[0045]
If it is determined in step S24 that acknowledgment data has been received, the process proceeds to step S25, in which the transmission output is set to be decremented by "1", and the process returns to step S22. However, it is determined that there is no reception. If so, it is determined in step S26 whether a preset reception time has passed.
[0046]
If the set time has not elapsed, the process returns to the standby process of step S23. If the set time has elapsed, it is determined that the communication has been interrupted, and the process proceeds to step S27 to perform setting for adding "1" to the transmission output. Then, the subroutine processing is completed, and the process proceeds to the next step of the original flowchart.
[0047]
By such a subroutine process, the reception sensitivity is maximum, and the transmission output can be adjusted to a place where a margin is provided from a place where communication is possible.
[0048]
FIG. 6 shows a flowchart of the polling data reception processing executed by the portable unit 40 when the anti-theft mode is set.
[0049]
The polling data receiving process is started when the portable unit 40 receives the polling data in the anti-theft mode, and transmits the acknowledgment data in step S30 and ends. The polling data reception program is executed by interruption when polling data is received even while another program is being executed. By this polling data reception processing, it is possible to determine whether or not communication with the counterpart unit has been disconnected in the anti-theft polling processing.
[0050]
This polling data reception processing is executed not only on the portable unit 40 side but also on the on-vehicle unit 10 side.
[0051]
The acknowledgment data transmitted here may be data representing only the meaning of the notification of the reception of the polling data, or may be data to which communication quality information is added. As a result, the communication quality information on the portable unit 40 side can be recognized on the in-vehicle unit 10 side, and it is possible to perform the optimal adjustment while also considering the communication quality information on the other party in the RF gain adjustment processing.
[0052]
The acknowledgment data may be data to which setting mode information such as an anti-theft mode and a position search mode is added. Thus, when the setting mode is changed in the portable unit 40, the setting of the in-vehicle unit 10 can be switched accordingly.
[0053]
As described above, according to the anti-theft polling process and the polling reception process (FIG. 6), for example, when a user stops a car in a parking lot and enters a house or a store, the in-vehicle unit 10 and the portable unit 40 are connected. Is set to the anti-theft mode, polling data and acknowledgment data are transmitted and received between the units 10 and 40 at predetermined intervals, and monitoring is performed to determine whether the vehicle has moved out of the communicable range. . When the vehicle moves out of the communicable range due to theft or the like, the vehicle unit 10 and the portable unit 40 detect it and emit a loud alarm sound from the vehicle unit 10 or notify the stolen by the portable unit 40. Is carried out to prevent theft.
[0054]
Further, since the communication between the Bluetooth modules 12 and 42 of the two units 10 and 40 is disconnected, it is detected that the vehicle has moved beyond a predetermined distance, and a notification or an alarm output is performed based on this detection. The configuration can be made at a lower cost as compared with a conventional technique for performing notification.
[0055]
In addition, even when the parking position of the car is near or far, the RF communication can be performed with the optimum output and sensitivity for the distance by the RF gain adjustment of the anti-theft polling process (step S3 in FIG. 3). In addition, it is possible to avoid such a problem that a delay occurs before the user notices the movement of the car, or that the communication is unstable even though the car is not moving, and a notification or an alarm is issued.
[0056]
In the RF gain adjustment (step S3 in FIG. 3), the same one is selected for both the in-vehicle unit 10 and the portable unit 40 for both the reception sensitivity adjustment in FIG. 4 and the transmission output adjustment in FIG. Need to be. Further, considering that both units 10 and 40 are driven by a battery, it is preferable to adjust the transmission output by maximizing the receiving sensitivity.
[0057]
By the way, in the anti-theft mode processing of the above-described embodiment, the vehicle is monitored by a direct data communication between the in-vehicle unit 10 and the portable unit 40 so as to monitor whether the vehicle is within a predetermined range. Since direct data communication can be performed only in the range of, it is impossible to cope with a situation where the parking position is too far away. Therefore, by exchanging the polink data and the acknowledgment data between the vehicle-mounted unit 10 and the portable unit 40 by relaying a plurality of Bluetooth devices, it is possible to cope with a case where the parking position is far away.
[0058]
For example, in a store or the like having a large parking lot, a Bluetooth device for relay is installed in the parking lot and the store, and when the in-vehicle unit 10 and the portable unit 40 are accommodated in the store and the parking lot, from there, The output polink data and acknowledgment data are transmitted to a partner unit by relaying the relay Bluetooth device. Furthermore, by using a communication protocol that can specify the number of relays, the number of relays can be specified by the user, so that the communication range between the portable unit 40 and the in-vehicle unit 10 can be set by the relay device. It is also possible to set a shorter range than the range.
[0059]
Next, an operation when the in-vehicle unit 10 and the portable unit 40 are set to the position search mode will be described.
[0060]
FIG. 7 shows a flowchart of a search process executed by the CPU 13 of the vehicle-mounted unit 10 when the position search mode is set.
[0061]
This position search process is started when the in-vehicle unit 10 is set to the position search mode by, for example, a user operation. When the position search process is started, first, in step S40, it is checked whether a communication link has been established with the other unit (portable unit 40), and this step S40 is repeated until the communication link is released. Then, for example, when the user moves away from the car with the portable unit 40 held, the communication link is released, and the process proceeds to the next step S41.
[0062]
In step S41, the transmission output is set to the maximum, and in the following step S42, the reception sensitivity is set to the maximum.
[0063]
Next, in step S43, a series of processing for establishing a communication link is performed, and in the next step S44, it is confirmed whether or not a communication link has been established with the counterpart unit (portable unit 40). The process is repeated, but if the communication link has been established, the process proceeds to the next step S45. The processing for establishing the communication link complies with the Bluetooth protocol, and the processing in steps S44 and S45 functions as monitoring means for monitoring the communication state.
[0064]
By the processing of steps S43 and S44, when the user returns to the range where communication with the car is possible, a communication link is established and this is recognized.
[0065]
When the communication link is established and the process proceeds to step S45, for example, a detection display such as blinking a hazard lamp of the car is performed. This makes it easier for the user to find his car. Then, the position search process ends.
[0066]
This position search process is performed not only by the in-vehicle unit 10 but also by the portable unit 40. When the user approaches the car and a communication link is established, the LED 47 and the buzzer 49 are driven to drive the car. Is notified to the user.
[0067]
By the above position search processing, for example, when the user finds his / her car in a vast parking lot, the establishment of communication between the Bluetooth modules 12 and 42 informs that his / her car is nearby, Can be easily found out.
[0068]
It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible. For example, the portable unit is not limited to being integrated with the key of the car, but may be incorporated in a mobile phone, for example. In this case, by taking the power supply of the portable unit from the power supply of the portable telephone, complicated handling related to power supply such as charging and battery replacement can be conveniently performed by the portable telephone and the portable unit, which is convenient.
[0069]
In the above-described position search processing, it is determined that the portable unit 40 and the vehicle-mounted unit 10 have approached each other by establishing a communication link. However, after establishing the communication link, polling data and acknowledge data are further transmitted and received. Alternatively, it may be determined that the position has approached.
[0070]
Further, in the above position search processing, the transmission output and the reception sensitivity are maximized in order to widen the detection range of the vehicle, but by allowing the user to select these values, the size of the detection range of the vehicle is determined by the user. You may make it selectable. In addition, by gradually reducing the transmission output and reception sensitivity after the link is established, the car can be more easily detected by repeatedly detecting the car while gradually reducing the detection range of the car. You can even find it.
[0071]
Furthermore, the present invention is not limited to automobiles, but can be used for general vehicles such as motorcycles, bicycles, and construction vehicles such as crane vehicles.
[0072]
【The invention's effect】
As described above, according to the present invention, for example, when a user parks a car in a parking lot and enters a house or a store, the communication between the vehicle-mounted unit and the portable unit monitors whether the vehicle is in a communicable range. When the vehicle moves out of the communicable range due to theft or the like, this is detected and a notification or an alarm is issued, thereby preventing the vehicle from being stolen.
[0073]
Furthermore, since the communication between the wireless communication means of the in-vehicle unit and the wireless communication means of the mobile unit is disconnected, it is detected that the vehicle has moved beyond a predetermined distance, and a notification or an alarm output is performed based on this detection. There is an effect that the configuration can be performed at a lower cost as compared with the related art or the like that performs notification by using.
[0074]
Further, even when the parking position of the car is close or far, the wireless communication can be performed with the optimum output and sensitivity for the distance, so that a delay occurs before the movement of the car is noticed. In addition, there is an effect that it is possible to avoid a problem that communication becomes unstable and a notification or an alarm is issued even though the vehicle is not moving.
[0075]
Also, by setting the second operation mode, the communication between the portable unit and the on-vehicle unit informs that the own vehicle is nearby. For example, when finding the own vehicle in a vast parking lot, Has the effect of being very convenient.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a vehicle-mounted unit of a vehicle detection system according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of a portable unit of the vehicle detection system.
FIG. 3 is a flowchart illustrating a processing procedure of anti-theft polling processing performed by the vehicle-mounted unit when the anti-theft mode is set.
FIG. 4 is a flowchart showing a procedure of a subroutine process when adjusting a reception gain as the RF gain adjustment process in FIG. 3;
FIG. 5 is a flowchart illustrating a procedure of a subroutine process in a case where a transmission gain is adjusted as the RF gain adjustment process of FIG. 3;
FIG. 6 is a flowchart showing a processing procedure of polling data reception processing executed by the portable unit when the anti-theft mode is set.
FIG. 7 is a flowchart illustrating a processing procedure of a search process executed by the portable unit when the position search mode is set.
[Explanation of symbols]
10 In-vehicle unit
11 Antenna
12 Bluetooth module (wireless communication means)
13 CPU
17 switch (mode selection means)
18 Buzzer (alarm means)
19 Lamp controller
40 Mobile unit
41 antenna
42 Bluetooth module (wireless communication means)
43 CPU
47 LED (notification means)
48 switch (mode selection means)
49 Buzzer (reporting means)

Claims (9)

An on-vehicle unit which is equipped with a wireless communication unit of Bluetooth standard and a communication monitoring unit for monitoring a communication state and an alarm unit for outputting an alarm, and is mounted on the vehicle and configured to be able to control lighting of a lamp of the vehicle,
A portable unit which is integrated with a vehicle key and has a portable communication unit having a communication monitoring means for monitoring a communication state and a communication means for monitoring a communication state of the Bluetooth standard,
Mode selection means provided in one or both of the in-vehicle unit and the portable unit to select an operation mode,
When the first operation mode is selected by the mode selection unit, after performing a gain adjustment process for adjusting the transmission output or reception sensitivity of the wireless communication unit of the on-vehicle unit or the wireless communication unit of the portable unit. When the communication monitoring means determines that the communication between the on-vehicle unit and the portable unit by the wireless communication means has been disconnected, a notification is made by the notifying means of the portable unit, and an alarm of the on-vehicle unit is issued. Means for outputting an alarm.
When the second operation mode is selected by the mode selection means, the communication between the wireless communication means of the on-vehicle unit and the wireless communication means of the portable unit is temporarily cut off, A vehicle detection system, wherein a notification is made by a notification unit of a portable unit, and a lamp of the vehicle is turned on under the control of the on-vehicle unit. An on-vehicle unit having wireless communication means and mounted on a vehicle,
A portable unit having a wireless communication unit and a communication monitoring unit for monitoring a communication state and a notifying unit, and having a portable unit,
When the communication monitoring means determines that the communication between the in-vehicle unit and the portable unit by the wireless communication means has been disconnected, the communication means is configured to operate the notification means to provide notification. Characteristic vehicle detection system. 3. The vehicle detection system according to claim 2, wherein said wireless communication means conforms to the Bluetooth standard. The in-vehicle unit is provided with a communication monitoring unit that monitors a communication state and an alarm unit that outputs an alarm,
When the communication monitoring means determines that the communication between the in-vehicle unit and the portable unit by the wireless communication means is disconnected, the warning means is operated to output an alarm. The vehicle detection system according to claim 2 or 3, wherein: In the state where the on-vehicle unit and the portable unit are separated from each other, a gain adjustment process for adjusting transmission output or reception sensitivity of the wireless communication means of the on-vehicle unit or the wireless communication means of the portable unit is performed. The vehicle detection system according to any one of claims 2 to 4, wherein: Mode selection means for selecting an operation mode in one or both of the in-vehicle unit and the portable unit is provided,
When the first operation mode is selected by the mode selection unit, the operation when the communication monitoring unit determines that the communication is disconnected is performed.
The system according to claim 1, wherein when the second operation mode is selected by the mode selection unit, the operation when the communication monitoring unit determines that the communication is disconnected is not performed. The vehicle detection system according to any one of claims 2 to 5. When the second operation mode is selected by the mode selection means,
7. The system according to claim 6, wherein the notification by the notification unit is performed when it is determined by the communication monitoring unit that the communication by the wireless communication unit has been once disconnected and then reconnected. Vehicle detection system. The on-vehicle unit is configured to be able to control the lighting of a vehicle lamp,
In the second operation mode, when it is determined by the communication monitoring means that the communication by the wireless communication means has been once disconnected and then reconnected, the lamp of the vehicle is turned on under the control of the on-vehicle unit. The vehicle detection system according to any one of claims 4 to 7, wherein: The vehicle detection system according to any one of claims 2 to 8, wherein the portable unit is integrally formed with a vehicle key.

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